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/fight.go

@@ -48,14 +48,14 @@ var addDam = [32]int{
 // setMname returns the monster name for the given monster (fight.c
 // set_mname).
 func (g *RogueGame) setMname(tp *Monster) string {
-	if !g.seeMonst(tp) && !g.Player.On(SeeMonst) {
+	if !g.seeMonst(tp) && !g.Player.On(SenseMonsters) {
 		if g.Options.Terse {
 			return "it"
 		}
 		return "something"
 	}
 	var mname string
-	if g.Player.On(IsHalu) {
+	if g.Player.On(Hallucinating) {
 		ch := int(g.mvinch(tp.Pos.Y, tp.Pos.X))
 		if !isUpper(byte(ch)) {
 			ch = g.rnd(26)
@@ -83,9 +83,9 @@ func (g *RogueGame) fight(mp Coord, weap *Object, thrown bool) bool {
 	g.Quiet = 0
 	g.runto(mp)
 	// Let him know it was really a xeroc (if it was one).
-	if tp.Type == 'X' && tp.Disguise != 'X' && !p.On(IsBlind) {
+	if tp.Type == 'X' && tp.Disguise != 'X' && !p.On(Blind) {
 		tp.Disguise = 'X'
-		if p.On(IsHalu) {
+		if p.On(Hallucinating) {
 			g.mvaddch(tp.Pos.Y, tp.Pos.X, byte(g.rnd(26)+'A'))
 		}
 		g.msg("%s", g.chooseStr("heavy!  That's a nasty critter!",
@@ -104,17 +104,17 @@ func (g *RogueGame) fight(mp Coord, weap *Object, thrown bool) bool {
 		} else {
 			g.hit("", mname, g.Options.Terse)
 		}
-		if p.On(CanHuh) {
+		if p.On(CanConfuse) {
 			didHit = true
-			tp.Flags.Set(IsHuh)
-			p.Flags.Clear(CanHuh)
+			tp.Flags.Set(Confused)
+			p.Flags.Clear(CanConfuse)
 			g.endmsg()
 			g.HasHit = false
 			g.msg("your hands stop glowing %s", g.pickColor("red"))
 		}
 		if tp.Stats.HP <= 0 {
 			g.killed(tp, true)
-		} else if didHit && !p.On(IsBlind) {
+		} else if didHit && !p.On(Blind) {
 			g.msg("%s appears confused", mname)
 		}
 		didHit = true
@@ -137,13 +137,13 @@ func (g *RogueGame) attack(mp *Monster) int {
 	g.Running = false
 	g.Count = 0
 	g.Quiet = 0
-	if g.ToDeath && !mp.On(IsTarget) {
+	if g.ToDeath && !mp.On(Targeted) {
 		g.ToDeath = false
 		g.Kamikaze = false
 	}
-	if mp.Type == 'X' && mp.Disguise != 'X' && !p.On(IsBlind) {
+	if mp.Type == 'X' && mp.Disguise != 'X' && !p.On(Blind) {
 		mp.Disguise = 'X'
-		if p.On(IsHalu) {
+		if p.On(Hallucinating) {
 			g.mvaddch(mp.Pos.Y, mp.Pos.X, byte(g.rnd(26)+'A'))
 		}
 	}
@@ -171,14 +171,14 @@ func (g *RogueGame) attack(mp *Monster) int {
 				g.ToDeath = false
 			}
 		}
-		if !mp.On(IsCanc) {
+		if !mp.On(Cancelled) {
 			switch mp.Type {
 			case 'A':
 				// If an aquator hits, you can lose armor class.
 				g.rustArmor(p.CurArmor)
 			case 'I':
 				// The ice monster freezes you
-				p.Flags.Clear(IsRun)
+				p.Flags.Clear(Awake)
 				if g.NoCommand == 0 {
 					g.addmsg("you are frozen")
 					if !g.Options.Terse {
@@ -193,7 +193,7 @@ func (g *RogueGame) attack(mp *Monster) int {
 			case 'R':
 				// Rattlesnakes have poisonous bites
 				if !g.save(VsPoison) {
-					if !p.IsWearing(RSustStr) {
+					if !p.IsWearing(RingSustainStrength) {
 						g.chgStr(-1)
 						if !g.Options.Terse {
 							g.msg("you feel a bite in your leg and now feel weaker")
@@ -243,7 +243,7 @@ func (g *RogueGame) attack(mp *Monster) int {
 				}
 			case 'F':
 				// Venus Flytrap stops the poor guy from moving
-				p.Flags.Set(IsHeld)
+				p.Flags.Set(Held)
 				p.VfHit++
 				g.Monsters['F'-'A'].Stats.Dmg = fmt.Sprintf("%dx1", p.VfHit)
 				if p.Stats.HP--; p.Stats.HP <= 0 {
@@ -330,20 +330,20 @@ func (g *RogueGame) rollEm(thatt, thdef *Creature, weap *Object, hurl bool) bool
 		hplus = weap.HPlus
 		dplus = weap.DPlus
 		if weap == p.CurWeapon {
-			if p.IsRing(Left, RAddDam) {
+			if p.IsRing(Left, RingIncreaseDamage) {
 				dplus += p.CurRing[Left].Arm
-			} else if p.IsRing(Left, RAddHit) {
+			} else if p.IsRing(Left, RingDexterity) {
 				hplus += p.CurRing[Left].Arm
 			}
-			if p.IsRing(Right, RAddDam) {
+			if p.IsRing(Right, RingIncreaseDamage) {
 				dplus += p.CurRing[Right].Arm
-			} else if p.IsRing(Right, RAddHit) {
+			} else if p.IsRing(Right, RingDexterity) {
 				hplus += p.CurRing[Right].Arm
 			}
 		}
 		cp = weap.Damage
 		if hurl {
-			if weap.Flags.Has(IsMissl) && p.CurWeapon != nil &&
+			if weap.Flags.Has(Missile) && p.CurWeapon != nil &&
 				p.CurWeapon.Which == weap.Launch {
 				cp = weap.HurlDmg
 				hplus += p.CurWeapon.HPlus
@@ -355,7 +355,7 @@ func (g *RogueGame) rollEm(thatt, thdef *Creature, weap *Object, hurl bool) bool
 	}
 	// If the creature being attacked is not running (asleep or held) then
 	// the attacker gets a plus four bonus to hit.
-	if !thdef.Flags.Has(IsRun) {
+	if !thdef.Flags.Has(Awake) {
 		hplus += 4
 	}
 	defArm := def.Arm
@@ -363,10 +363,10 @@ func (g *RogueGame) rollEm(thatt, thdef *Creature, weap *Object, hurl bool) bool
 		if p.CurArmor != nil {
 			defArm = p.CurArmor.Arm
 		}
-		if p.IsRing(Left, RProtect) {
+		if p.IsRing(Left, RingProtection) {
 			defArm -= p.CurRing[Left].Arm
 		}
-		if p.IsRing(Right, RProtect) {
+		if p.IsRing(Right, RingProtection) {
 			defArm -= p.CurRing[Right].Arm
 		}
 	}
@@ -512,7 +512,7 @@ func (g *RogueGame) removeMon(mp Coord, tp *Monster, waskill bool) {
 	g.Level.SetMonsterAt(mp.Y, mp.X, nil)
 	g.mvaddch(mp.Y, mp.X, tp.OldCh)
 	detachMon(&g.Level.Monsters, tp)
-	if tp.On(IsTarget) {
+	if tp.On(Targeted) {
 		g.Kamikaze = false
 		g.ToDeath = false
 		if g.Options.FightFlush {
@@ -529,7 +529,7 @@ func (g *RogueGame) killed(tp *Monster, pr bool) {
 	// If the monster was a venus flytrap, un-hold him
 	switch tp.Type {
 	case 'F':
-		p.Flags.Clear(IsHeld)
+		p.Flags.Clear(Held)
 		p.VfHit = 0
 		g.Monsters['F'-'A'].Stats.Dmg = "000x0"
 	case 'L':