Rename constants to descriptive names (refactor step 1)

Pure rename, no behavior change; the full suite (RNG goldens,
generation invariants, scripted sessions, save round trip) is
unchanged and green.

- Creature flags: IsHuh→Confused, IsHalu→Hallucinating,
  CanHuh→CanConfuse, CanSee→CanSeeInvisible, IsRun→Awake,
  SeeMonst→SenseMonsters, IsCanc→Cancelled, IsLevit→Levitating,
  IsBlind/IsGreed/IsHaste/IsTarget/IsHeld/IsInvis/IsMean/IsRegen/
  IsFly/IsSlow → Blind/Greedy/Hasted/Targeted/Held/Invisible/Mean/
  Regenerates/Flying/Slowed, IsFound→Found
- Object flags: IsCursed→Cursed, IsKnow→Known, IsMissl→Missile,
  IsMany→Stackable, ObjIsFound→WasFound, IsProt→Protected
- Room flags: IsDark/IsGone/IsMaze → Dark/Gone/Maze; place flags:
  FPass→FPassage, FPNum→FPassNum, FTMask→FTrapMask
- Trap types: TDoor→TrapDoor ... TMyst→TrapMystery
- Item subtypes: P*→Potion* (PLSD→PotionLSD, PMFind→
  PotionDetectMonsters, ...), S*→Scroll* (SIDRorS→
  ScrollIdentifyRingOrStick, ...), R*→Ring* (RAddHit→RingDexterity,
  RNop→RingAdornment, ...), Ws*→Wand* (WsElect→WandLightning, ...),
  weapons (TwoSword→WeaponTwoHandedSword, Shiraken→WeaponShuriken,
  ...), armor (RingMail→ArmorRingMail, ...)
- Counts: Max{Potions,Scrolls,Rings,Sticks,Weapons,Armors} →
  Num{Potion,Scroll,Ring,Wand,Weapon,Armor}Types; NTraps→NumTrapTypes
- Level.NTraps field → TrapCount (also in the save snapshot)
- Original C constant names preserved as comment breadcrumbs in
  types.go so the lineage stays greppable

TODO.md: step 1 moved to Completed, step 2 (typed kinds) promoted to
Next Step.

game/tables.go

@@ -9,7 +9,7 @@ package game
 var initStats = Stats{Str: 16, Exp: 0, Lvl: 1, Arm: 10, HP: 12, Dmg: "1x4", MaxHP: 12}
 
 // aClass is extern.c a_class[]: armor class for each armor type.
-var aClass = [MaxArmors]int{
+var aClass = [NumArmorTypes]int{
 	8, // LEATHER
 	7, // RING_MAIL
 	7, // STUDDED_LEATHER
@@ -28,7 +28,7 @@ var eLevels = []int{
 }
 
 // trName is extern.c tr_name[]: names of the traps.
-var trName = [NTraps]string{
+var trName = [NumTrapTypes]string{
 	"a trapdoor",
 	"an arrow trap",
 	"a sleeping gas trap",
@@ -47,32 +47,32 @@ var invTName = []string{"Overwrite", "Slow", "Clear"}
 // rolled from the level at creation time.
 var monsterTable = [26]MonsterKind{
 	/* Name             CARRY  FLAGS                          str exp  lvl arm hp  dmg */
-	{"aquator", 0, IsMean, Stats{10, 20, 5, 2, 1, "0x0/0x0", 0}},
-	{"bat", 0, IsFly, Stats{10, 1, 1, 3, 1, "1x2", 0}},
+	{"aquator", 0, Mean, Stats{10, 20, 5, 2, 1, "0x0/0x0", 0}},
+	{"bat", 0, Flying, Stats{10, 1, 1, 3, 1, "1x2", 0}},
 	{"centaur", 15, 0, Stats{10, 17, 4, 4, 1, "1x2/1x5/1x5", 0}},
-	{"dragon", 100, IsMean, Stats{10, 5000, 10, -1, 1, "1x8/1x8/3x10", 0}},
-	{"emu", 0, IsMean, Stats{10, 2, 1, 7, 1, "1x2", 0}},
-	{"venus flytrap", 0, IsMean, Stats{10, 80, 8, 3, 1, "%%%x0", 0}},
-	{"griffin", 20, IsMean | IsFly | IsRegen, Stats{10, 2000, 13, 2, 1, "4x3/3x5", 0}},
-	{"hobgoblin", 0, IsMean, Stats{10, 3, 1, 5, 1, "1x8", 0}},
+	{"dragon", 100, Mean, Stats{10, 5000, 10, -1, 1, "1x8/1x8/3x10", 0}},
+	{"emu", 0, Mean, Stats{10, 2, 1, 7, 1, "1x2", 0}},
+	{"venus flytrap", 0, Mean, Stats{10, 80, 8, 3, 1, "%%%x0", 0}},
+	{"griffin", 20, Mean | Flying | Regenerates, Stats{10, 2000, 13, 2, 1, "4x3/3x5", 0}},
+	{"hobgoblin", 0, Mean, Stats{10, 3, 1, 5, 1, "1x8", 0}},
 	{"ice monster", 0, 0, Stats{10, 5, 1, 9, 1, "0x0", 0}},
 	{"jabberwock", 70, 0, Stats{10, 3000, 15, 6, 1, "2x12/2x4", 0}},
-	{"kestrel", 0, IsMean | IsFly, Stats{10, 1, 1, 7, 1, "1x4", 0}},
+	{"kestrel", 0, Mean | Flying, Stats{10, 1, 1, 7, 1, "1x4", 0}},
 	{"leprechaun", 0, 0, Stats{10, 10, 3, 8, 1, "1x1", 0}},
-	{"medusa", 40, IsMean, Stats{10, 200, 8, 2, 1, "3x4/3x4/2x5", 0}},
+	{"medusa", 40, Mean, Stats{10, 200, 8, 2, 1, "3x4/3x4/2x5", 0}},
 	{"nymph", 100, 0, Stats{10, 37, 3, 9, 1, "0x0", 0}},
-	{"orc", 15, IsGreed, Stats{10, 5, 1, 6, 1, "1x8", 0}},
-	{"phantom", 0, IsInvis, Stats{10, 120, 8, 3, 1, "4x4", 0}},
-	{"quagga", 0, IsMean, Stats{10, 15, 3, 3, 1, "1x5/1x5", 0}},
-	{"rattlesnake", 0, IsMean, Stats{10, 9, 2, 3, 1, "1x6", 0}},
-	{"snake", 0, IsMean, Stats{10, 2, 1, 5, 1, "1x3", 0}},
-	{"troll", 50, IsRegen | IsMean, Stats{10, 120, 6, 4, 1, "1x8/1x8/2x6", 0}},
-	{"black unicorn", 0, IsMean, Stats{10, 190, 7, -2, 1, "1x9/1x9/2x9", 0}},
-	{"vampire", 20, IsRegen | IsMean, Stats{10, 350, 8, 1, 1, "1x10", 0}},
+	{"orc", 15, Greedy, Stats{10, 5, 1, 6, 1, "1x8", 0}},
+	{"phantom", 0, Invisible, Stats{10, 120, 8, 3, 1, "4x4", 0}},
+	{"quagga", 0, Mean, Stats{10, 15, 3, 3, 1, "1x5/1x5", 0}},
+	{"rattlesnake", 0, Mean, Stats{10, 9, 2, 3, 1, "1x6", 0}},
+	{"snake", 0, Mean, Stats{10, 2, 1, 5, 1, "1x3", 0}},
+	{"troll", 50, Regenerates | Mean, Stats{10, 120, 6, 4, 1, "1x8/1x8/2x6", 0}},
+	{"black unicorn", 0, Mean, Stats{10, 190, 7, -2, 1, "1x9/1x9/2x9", 0}},
+	{"vampire", 20, Regenerates | Mean, Stats{10, 350, 8, 1, 1, "1x10", 0}},
 	{"wraith", 0, 0, Stats{10, 55, 5, 4, 1, "1x6", 0}},
 	{"xeroc", 30, 0, Stats{10, 100, 7, 7, 1, "4x4", 0}},
 	{"yeti", 30, 0, Stats{10, 50, 4, 6, 1, "1x6/1x6", 0}},
-	{"zombie", 0, IsMean, Stats{10, 6, 2, 8, 1, "1x8", 0}},
+	{"zombie", 0, Mean, Stats{10, 6, 2, 8, 1, "1x8", 0}},
 }
 
 // Base ObjInfo tables (extern.c). These are templates: NewGame copies them
@@ -88,7 +88,7 @@ var baseThings = [NumThings]ObjInfo{
 	{Prob: 4},  // stick
 }
 
-var baseArmInfo = [MaxArmors]ObjInfo{
+var baseArmInfo = [NumArmorTypes]ObjInfo{
 	{Name: "leather armor", Prob: 20, Worth: 20},
 	{Name: "ring mail", Prob: 15, Worth: 25},
 	{Name: "studded leather armor", Prob: 15, Worth: 20},
@@ -99,7 +99,7 @@ var baseArmInfo = [MaxArmors]ObjInfo{
 	{Name: "plate mail", Prob: 5, Worth: 150},
 }
 
-var basePotInfo = [MaxPotions]ObjInfo{
+var basePotInfo = [NumPotionTypes]ObjInfo{
 	{Name: "confusion", Prob: 7, Worth: 5},
 	{Name: "hallucination", Prob: 8, Worth: 5},
 	{Name: "poison", Prob: 8, Worth: 5},
@@ -116,7 +116,7 @@ var basePotInfo = [MaxPotions]ObjInfo{
 	{Name: "levitation", Prob: 6, Worth: 75},
 }
 
-var baseRingInfo = [MaxRings]ObjInfo{
+var baseRingInfo = [NumRingTypes]ObjInfo{
 	{Name: "protection", Prob: 9, Worth: 400},
 	{Name: "add strength", Prob: 9, Worth: 400},
 	{Name: "sustain strength", Prob: 5, Worth: 280},
@@ -133,7 +133,7 @@ var baseRingInfo = [MaxRings]ObjInfo{
 	{Name: "maintain armor", Prob: 5, Worth: 380},
 }
 
-var baseScrInfo = [MaxScrolls]ObjInfo{
+var baseScrInfo = [NumScrollTypes]ObjInfo{
 	{Name: "monster confusion", Prob: 7, Worth: 140},
 	{Name: "magic mapping", Prob: 4, Worth: 150},
 	{Name: "hold monster", Prob: 2, Worth: 180},
@@ -154,7 +154,7 @@ var baseScrInfo = [MaxScrolls]ObjInfo{
 	{Name: "protect armor", Prob: 2, Worth: 250},
 }
 
-var baseWeapInfo = [MaxWeapons + 1]ObjInfo{
+var baseWeapInfo = [NumWeaponTypes + 1]ObjInfo{
 	{Name: "mace", Prob: 11, Worth: 8},
 	{Name: "long sword", Prob: 11, Worth: 15},
 	{Name: "short bow", Prob: 12, Worth: 15},
@@ -167,7 +167,7 @@ var baseWeapInfo = [MaxWeapons + 1]ObjInfo{
 	{}, // DO NOT REMOVE: fake entry for dragon's breath
 }
 
-var baseWsInfo = [MaxSticks]ObjInfo{
+var baseWsInfo = [NumWandTypes]ObjInfo{
 	{Name: "light", Prob: 12, Worth: 250},
 	{Name: "invisibility", Prob: 6, Worth: 5},
 	{Name: "lightning", Prob: 3, Worth: 330},