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/rooms.go

@@ -33,14 +33,14 @@ func (g *RogueGame) doRooms() {
 	// Put the gone rooms, if any, on the level
 	leftOut := g.rnd(4)
 	for i := 0; i < leftOut; i++ {
-		g.Level.Rooms[g.rndRoom()].Flags.Set(IsGone)
+		g.Level.Rooms[g.rndRoom()].Flags.Set(Gone)
 	}
 	// dig and populate all the rooms on the level
 	for i := range g.Level.Rooms {
 		rp := &g.Level.Rooms[i]
 		// Find upper left corner of box that this room goes in
 		top := Coord{X: (i%3)*bsze.X + 1, Y: (i / 3) * bsze.Y}
-		if rp.Flags.Has(IsGone) {
+		if rp.Flags.Has(Gone) {
 			// Place a gone room.  Make certain that there is a blank line
 			// for passage drawing.
 			for {
@@ -56,13 +56,13 @@ func (g *RogueGame) doRooms() {
 		}
 		// set room type
 		if g.rnd(10) < g.Depth-1 {
-			rp.Flags.Set(IsDark) // dark room
+			rp.Flags.Set(Dark) // dark room
 			if g.rnd(15) == 0 {
-				rp.Flags = IsMaze // maze room
+				rp.Flags = Maze // maze room
 			}
 		}
 		// Find a place and size for a random room
-		if rp.Flags.Has(IsMaze) {
+		if rp.Flags.Has(Maze) {
 			rp.Max.X = bsze.X - 1
 			rp.Max.Y = bsze.Y - 1
 			if rp.Pos.X = top.X; rp.Pos.X == 1 {
@@ -92,7 +92,7 @@ func (g *RogueGame) doRooms() {
 			rp.Gold, _ = g.findFloorIn(rp, 0, false)
 			gold.Pos = rp.Gold
 			g.Level.SetChar(rp.Gold.Y, rp.Gold.X, Gold)
-			gold.Flags = IsMany
+			gold.Flags = Stackable
 			gold.Group = goldGrp
 			gold.Type = Gold
 			attachObj(&g.Level.Objects, gold)
@@ -114,7 +114,7 @@ func (g *RogueGame) doRooms() {
 // drawRoom draws a box around a room and lays down the floor for normal
 // rooms; for maze rooms, draws the maze (rooms.c draw_room).
 func (g *RogueGame) drawRoom(rp *Room) {
-	if rp.Flags.Has(IsMaze) {
+	if rp.Flags.Has(Maze) {
 		g.doMaze(rp)
 		return
 	}
@@ -180,7 +180,7 @@ func (g *RogueGame) dig(y, x int) {
 			if newy < 0 || newy > m.maxy || newx < 0 || newx > m.maxx {
 				continue
 			}
-			if g.Level.FlagsAt(newy+m.starty, newx+m.startx).Has(FPass) {
+			if g.Level.FlagsAt(newy+m.starty, newx+m.startx).Has(FPassage) {
 				continue
 			}
 			if cnt++; g.rnd(cnt) == 0 {
@@ -257,7 +257,7 @@ func (g *RogueGame) findFloorImpl(rp *Room, limit int, monst, pickroom bool) (Co
 	var compchar byte
 	if !pickroom {
 		compchar = Floor
-		if rp.Flags.Has(IsMaze) {
+		if rp.Flags.Has(Maze) {
 			compchar = Passage
 		}
 	}
@@ -271,7 +271,7 @@ func (g *RogueGame) findFloorImpl(rp *Room, limit int, monst, pickroom bool) (Co
 		if pickroom {
 			rp = &g.Level.Rooms[g.rndRoom()]
 			compchar = Floor
-			if rp.Flags.Has(IsMaze) {
+			if rp.Flags.Has(Maze) {
 				compchar = Passage
 			}
 		}
@@ -294,7 +294,7 @@ func (g *RogueGame) enterRoom(cp Coord) {
 	rp := g.roomin(cp)
 	p.Room = rp
 	g.doorOpen(rp)
-	if !rp.Flags.Has(IsDark) && !p.On(IsBlind) {
+	if !rp.Flags.Has(Dark) && !p.On(Blind) {
 		for y := rp.Pos.Y; y < rp.Max.Y+rp.Pos.Y; y++ {
 			g.move(y, rp.Pos.X)
 			for x := rp.Pos.X; x < rp.Max.X+rp.Pos.X; x++ {
@@ -309,7 +309,7 @@ func (g *RogueGame) enterRoom(cp Coord) {
 				} else {
 					tp.OldCh = ch
 					if !g.seeMonst(tp) {
-						if p.On(SeeMonst) {
+						if p.On(SenseMonsters) {
 							g.standout()
 							g.addch(tp.Disguise)
 							g.standend()
@@ -330,21 +330,21 @@ func (g *RogueGame) leaveRoom(cp Coord) {
 	p := &g.Player
 	rp := p.Room
 
-	if rp.Flags.Has(IsMaze) {
+	if rp.Flags.Has(Maze) {
 		return
 	}
 
 	var floor byte
 	switch {
-	case rp.Flags.Has(IsGone):
+	case rp.Flags.Has(Gone):
 		floor = Passage
-	case !rp.Flags.Has(IsDark) || p.On(IsBlind):
+	case !rp.Flags.Has(Dark) || p.On(Blind):
 		floor = Floor
 	default:
 		floor = ' '
 	}
 
-	p.Room = &g.Level.Passages[*g.Level.FlagsAt(cp.Y, cp.X)&FPNum]
+	p.Room = &g.Level.Passages[*g.Level.FlagsAt(cp.Y, cp.X)&FPassNum]
 	for y := rp.Pos.Y; y < rp.Max.Y+rp.Pos.Y; y++ {
 		for x := rp.Pos.X; x < rp.Max.X+rp.Pos.X; x++ {
 			g.move(y, x)
@@ -357,7 +357,7 @@ func (g *RogueGame) leaveRoom(cp Coord) {
 				// to check for monster, we have to strip out the standout
 				// bit (our Window returns the bare character already)
 				if isUpper(ch) {
-					if p.On(SeeMonst) {
+					if p.On(SenseMonsters) {
 						g.standout()
 						g.addch(ch)
 						g.standend()