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/overworld/init_map.asm

@@ -29,7 +29,7 @@ ReanchorBGMap_NoOAMUpdate::
 	call OverworldTextModeSwitch
 	ld a, HIGH(vBGMap1)
 	call .LoadBGMapAddrIntoHRAM
-	call _OpenAndCloseMenu_HDMATransferTileMapAndAttrMap
+	call _OpenAndCloseMenu_HDMATransferTilemapAndAttrmap
 	farcall LoadOW_BGPal7
 	farcall ApplyPals
 	ld a, $1
@@ -84,7 +84,7 @@ HDMATransfer_FillBGMap0WithBlack:
 
 	ld a, "■"
 	ld hl, wDecompressScratch
-	ld bc, wScratchAttrMap - wDecompressScratch
+	ld bc, wScratchAttrmap - wDecompressScratch
 	call ByteFill
 	ld a, HIGH(wDecompressScratch)
 	ldh [rHDMA1], a

engine/overworld/player_object.asm

@@ -5,11 +5,11 @@ BlankScreen:
 	call ClearBGPalettes
 	call ClearSprites
 	hlcoord 0, 0
-	ld bc, wTileMapEnd - wTileMap
+	ld bc, wTilemapEnd - wTilemap
 	ld a, " "
 	call ByteFill
-	hlcoord 0, 0, wAttrMap
-	ld bc, wAttrMapEnd - wAttrMap
+	hlcoord 0, 0, wAttrmap
+	ld bc, wAttrmapEnd - wAttrmap
 	ld a, $7
 	call ByteFill
 	call WaitBGMap2

engine/overworld/scripting.asm

@@ -2643,7 +2643,7 @@ Script_writeunusedbytebuffer:
 Script_closetext:
 ; script command 0x49
 
-	call _OpenAndCloseMenu_HDMATransferTileMapAndAttrMap
+	call _OpenAndCloseMenu_HDMATransferTilemapAndAttrmap
 	call CloseText
 	ret
 

engine/overworld/warp_connection.asm

@@ -233,7 +233,7 @@ LoadMapTimeOfDay:
 	farcall UpdateTimeOfDayPal
 	call OverworldTextModeSwitch
 	call .ClearBGMap
-	call .PushAttrMap
+	call .PushAttrmap
 	ret
 
 .ClearBGMap:
@@ -264,14 +264,14 @@ LoadMapTimeOfDay:
 	call ByteFill
 	ret
 
-.PushAttrMap:
+.PushAttrmap:
 	decoord 0, 0
 	call .copy
 	ldh a, [hCGB]
 	and a
 	ret z
 
-	decoord 0, 0, wAttrMap
+	decoord 0, 0, wAttrmap
 	ld a, $1
 	ldh [rVBK], a
 .copy