Standardize on lowercase Tilemap and Attrmap

We used to have a mixture of TileMap and and Tilemap, as well as the
similar AttrMap. Standardize on one.

engine/games/card_flip.asm

@@ -14,7 +14,7 @@ _CardFlip:
 	ld hl, wOptions
 	set NO_TEXT_SCROLL, [hl]
 	call ClearBGPalettes
-	call ClearTileMap
+	call ClearTilemap
 	call ClearSprites
 	ld de, MUSIC_NONE
 	call PlayMusic
@@ -457,7 +457,7 @@ CardFlip_DisplayCardFaceUp:
 	ret z
 
 	; Set the attributes
-	ld de, wAttrMap - wTileMap
+	ld de, wAttrmap - wTilemap
 	add hl, de
 	ld a, [wCardFlipFaceUpCard]
 	and 3
@@ -1558,32 +1558,32 @@ CardFlip_InitAttrPals:
 	and a
 	ret z
 
-	hlcoord 0, 0, wAttrMap
+	hlcoord 0, 0, wAttrmap
 	ld bc, SCREEN_HEIGHT * SCREEN_WIDTH
 	xor a
 	call ByteFill
 
-	hlcoord 12, 1, wAttrMap
+	hlcoord 12, 1, wAttrmap
 	lb bc, 2, 2
 	ld a, $1
 	call CardFlip_FillBox
 
-	hlcoord 14, 1, wAttrMap
+	hlcoord 14, 1, wAttrmap
 	lb bc, 2, 2
 	ld a, $2
 	call CardFlip_FillBox
 
-	hlcoord 16, 1, wAttrMap
+	hlcoord 16, 1, wAttrmap
 	lb bc, 2, 2
 	ld a, $3
 	call CardFlip_FillBox
 
-	hlcoord 18, 1, wAttrMap
+	hlcoord 18, 1, wAttrmap
 	lb bc, 2, 2
 	ld a, $4
 	call CardFlip_FillBox
 
-	hlcoord 9, 0, wAttrMap
+	hlcoord 9, 0, wAttrmap
 	lb bc, 12, 1
 	ld a, $1
 	call CardFlip_FillBox

engine/games/slot_machine.asm

@@ -96,7 +96,7 @@ _SlotMachine:
 
 .InitGFX:
 	call ClearBGPalettes
-	call ClearTileMap
+	call ClearTilemap
 	call ClearSprites
 	ld de, MUSIC_NONE
 	call PlayMusic

engine/games/unown_puzzle.asm

@@ -9,7 +9,7 @@ _UnownPuzzle:
 	ld a, $1
 	ldh [hInMenu], a
 	call ClearBGPalettes
-	call ClearTileMap
+	call ClearTilemap
 	call ClearSprites
 	xor a
 	ldh [hBGMapMode], a
@@ -83,7 +83,7 @@ _UnownPuzzle:
 	pop af
 	ldh [hInMenu], a
 	call ClearBGPalettes
-	call ClearTileMap
+	call ClearTilemap
 	call ClearSprites
 	ld a, LCDC_DEFAULT
 	ldh [rLCDC], a