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/events/bug_contest/display_stats.asm

@@ -1,6 +1,6 @@
 DisplayCaughtContestMonStats:
 	call ClearBGPalettes
-	call ClearTileMap
+	call ClearTilemap
 	call ClearSprites
 	call LoadFontsBattleExtra
 

engine/events/diploma.asm

@@ -5,7 +5,7 @@ _Diploma:
 
 PlaceDiplomaOnScreen:
 	call ClearBGPalettes
-	call ClearTileMap
+	call ClearTilemap
 	call ClearSprites
 	call DisableLCD
 	ld hl, DiplomaGFX

engine/events/magnet_train.asm

@@ -70,7 +70,7 @@ MagnetTrain:
 	ld [wRequested2bppDest], a
 	ld [wRequested2bppDest + 1], a
 	ld [wRequested2bpp], a
-	call ClearTileMap
+	call ClearTilemap
 
 	pop af
 	ldh [hSCY], a

engine/events/map_name_sign.asm

@@ -135,7 +135,7 @@ InitMapNameFrame:
 	hlcoord 0, 0
 	ld b, 2
 	ld c, 18
-	call InitMapSignAttrMap
+	call InitMapSignAttrmap
 	call PlaceMapNameFrame
 	ret
 
@@ -171,8 +171,8 @@ PlaceMapNameCenterAlign:
 	pop hl
 	ret
 
-InitMapSignAttrMap:
-	ld de, wAttrMap - wTileMap
+InitMapSignAttrmap:
+	ld de, wAttrmap - wTilemap
 	add hl, de
 	inc b
 	inc b

engine/events/print_unown.asm

@@ -15,7 +15,7 @@ _UnownPrinter:
 	set NO_TEXT_SCROLL, a
 	ld [wOptions], a
 	call ClearBGPalettes
-	call ClearTileMap
+	call ClearTilemap
 
 	ld de, UnownDexATile
 	ld hl, vTiles0 tile UNOWNSTAMP_BOLD_A

engine/events/unown_walls.asm

@@ -139,7 +139,7 @@ DisplayUnownWords:
 	jr nz, .loop2
 .copy
 	call _DisplayUnownWords_CopyWord
-	ld bc, wAttrMap - wTileMap
+	ld bc, wAttrmap - wTilemap
 	add hl, bc
 	call _DisplayUnownWords_FillAttr
 	call WaitBGMap2