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/rip.go

@@ -121,12 +121,12 @@ func (g *RogueGame) totalWinner() {
 		case Weapon:
 			worth = it.Weapons[obj.Which].Worth
 			worth *= 3*(obj.HPlus+obj.DPlus) + obj.Count
-			obj.Flags.Set(IsKnow)
+			obj.Flags.Set(Known)
 		case Armor:
 			worth = it.Armors[obj.Which].Worth
 			worth += (9 - obj.Arm) * 100
 			worth += 10 * (aClass[obj.Which] - obj.Arm)
-			obj.Flags.Set(IsKnow)
+			obj.Flags.Set(Known)
 		case Scroll:
 			op := &it.Scrolls[obj.Which]
 			worth = op.Worth * obj.Count
@@ -144,27 +144,27 @@ func (g *RogueGame) totalWinner() {
 		case Ring:
 			op := &it.Rings[obj.Which]
 			worth = op.Worth
-			if obj.Which == RAddStr || obj.Which == RAddDam ||
-				obj.Which == RProtect || obj.Which == RAddHit {
+			if obj.Which == RingAddStrength || obj.Which == RingIncreaseDamage ||
+				obj.Which == RingProtection || obj.Which == RingDexterity {
 				if obj.Arm > 0 {
 					worth += obj.Arm * 100
 				} else {
 					worth = 10
 				}
 			}
-			if !obj.Flags.Has(IsKnow) {
+			if !obj.Flags.Has(Known) {
 				worth /= 2
 			}
-			obj.Flags.Set(IsKnow)
+			obj.Flags.Set(Known)
 			op.Know = true
 		case Stick:
 			op := &it.Sticks[obj.Which]
 			worth = op.Worth
 			worth += 20 * obj.Charges()
-			if !obj.Flags.Has(IsKnow) {
+			if !obj.Flags.Has(Known) {
 				worth /= 2
 			}
-			obj.Flags.Set(IsKnow)
+			obj.Flags.Set(Known)
 			op.Know = true
 		case Amulet:
 			worth = 1000