Rename "feet and head follow" commands

The lot of these were rather misnamed, since they're used to replace
part of the player or enemy with objects for several background effects.
https://github.com/pret/pokecrystal/pull/578#issuecomment-440996244

engine/battle_anims/anim_commands.asm

@@ -334,8 +334,8 @@ BattleAnimCommands::
 	dw BattleAnimCmd_IncObj
 	dw BattleAnimCmd_SetObj
 	dw BattleAnimCmd_IncBGEffect
-	dw BattleAnimCmd_EnemyFeetObj
-	dw BattleAnimCmd_PlayerHeadObj
+	dw BattleAnimCmd_BattlerGFX_1Row
+	dw BattleAnimCmd_BattlerGFX_2Row
 	dw BattleAnimCmd_CheckPokeball
 	dw BattleAnimCmd_Transform
 	dw BattleAnimCmd_RaiseSub
@@ -681,7 +681,7 @@ endr
 	ld de, vTiles0 tile BATTLEANIM_BASE_TILE
 	add hl, de
 	ld a, [wBattleAnimByte]
-	call LoadBattleAnimObj
+	call LoadBattleAnimGFX
 	ld a, [wBattleAnimTemp0]
 	add c
 	ld [wBattleAnimTemp0], a
@@ -767,7 +767,7 @@ BattleAnimCmd_SetObj:
 	ld [hl], a
 	ret
 
-BattleAnimCmd_EnemyFeetObj:
+BattleAnimCmd_BattlerGFX_1Row:
 	ld hl, wBattleAnimTileDict
 .loop
 	ld a, [hl]
@@ -778,11 +778,11 @@ BattleAnimCmd_EnemyFeetObj:
 	jr .loop
 
 .okay
-	ld a, ANIM_GFX_PLAYER
+	ld a, ANIM_GFX_PLAYERHEAD
 	ld [hli], a
 	ld a, ($80 - 6 - 7) - BATTLEANIM_BASE_TILE
 	ld [hli], a
-	ld a, ANIM_GFX_ENEMY
+	ld a, ANIM_GFX_ENEMYFEET
 	ld [hli], a
 	ld a, ($80 - 6) - BATTLEANIM_BASE_TILE
 	ld [hl], a
@@ -821,7 +821,7 @@ BattleAnimCmd_EnemyFeetObj:
 	jr nz, .LoadFeet
 	ret
 
-BattleAnimCmd_PlayerHeadObj:
+BattleAnimCmd_BattlerGFX_2Row:
 	ld hl, wBattleAnimTileDict
 .loop
 	ld a, [hl]
@@ -832,11 +832,11 @@ BattleAnimCmd_PlayerHeadObj:
 	jr .loop
 
 .okay
-	ld a, ANIM_GFX_PLAYER
+	ld a, ANIM_GFX_PLAYERHEAD
 	ld [hli], a
 	ld a, ($80 - 6 * 2 - 7 * 2) - BATTLEANIM_BASE_TILE
 	ld [hli], a
-	ld a, ANIM_GFX_ENEMY
+	ld a, ANIM_GFX_ENEMYFEET
 	ld [hli], a
 	ld a, ($80 - 6 * 2) - BATTLEANIM_BASE_TILE
 	ld [hl], a

engine/battle_anims/bg_effects.asm

@@ -96,8 +96,8 @@ BattleBGEffects:
 	dw BattleBGEffect_Whirlpool
 	dw BattleBGEffect_Teleport
 	dw BattleBGEffect_NightShade
-	dw BattleBGEffect_FeetFollow
-	dw BattleBGEffect_HeadFollow
+	dw BattleBGEffect_BattlerObj_1Row
+	dw BattleBGEffect_BattlerObj_2Row
 	dw BattleBGEffect_DoubleTeam
 	dw BattleBGEffect_AcidArmor
 	dw BattleBGEffect_RapidFlash
@@ -403,7 +403,7 @@ BattleBGEffect_ShowMon:
 	db  3, $00, 3
 	db -1
 
-BattleBGEffect_FeetFollow:
+BattleBGEffect_BattlerObj_1Row:
 	call BattleBGEffects_AnonJumptable
 .anon_dw
 	dw .zero
@@ -425,14 +425,14 @@ BattleBGEffect_FeetFollow:
 	call BattleBGEffects_IncrementJumptable
 	push bc
 	call BGEffect_CheckBattleTurn
-	jr nz, .player_turn
-	ld a, ANIM_OBJ_PLAYERFEETFOLLOW
+	jr nz, .player_side
+	ld a, ANIM_OBJ_ENEMYFEET_1ROW
 	ld [wBattleObjectTempID], a
 	ld a, 16 * TILE_WIDTH + 4
 	jr .okay
 
-.player_turn
-	ld a, ANIM_OBJ_ENEMYFEETFOLLOW
+.player_side
+	ld a, ANIM_OBJ_PLAYERHEAD_1ROW
 	ld [wBattleObjectTempID], a
 	ld a, 6 * TILE_WIDTH
 .okay
@@ -449,12 +449,12 @@ BattleBGEffect_FeetFollow:
 	call BattleBGEffects_IncrementJumptable
 	push bc
 	call BGEffect_CheckBattleTurn
-	jr nz, .player_turn_2
+	jr nz, .player_side_2
 	hlcoord 12, 6
 	lb bc, 1, 7
 	jr .okay2
 
-.player_turn_2
+.player_side_2
 	hlcoord 2, 6
 	lb bc, 1, 6
 .okay2
@@ -470,7 +470,7 @@ BattleBGEffect_FeetFollow:
 	call EndBattleBGEffect
 	ret
 
-BattleBGEffect_HeadFollow:
+BattleBGEffect_BattlerObj_2Row:
 	call BattleBGEffects_AnonJumptable
 .anon_dw
 	dw .zero
@@ -492,14 +492,14 @@ BattleBGEffect_HeadFollow:
 	call BattleBGEffects_IncrementJumptable
 	push bc
 	call BGEffect_CheckBattleTurn
-	jr nz, .player_turn
-	ld a, ANIM_OBJ_PLAYERHEADFOLLOW
+	jr nz, .player_side
+	ld a, ANIM_OBJ_ENEMYFEET_2ROW
 	ld [wBattleObjectTempID], a
 	ld a, 16 * TILE_WIDTH + 4
 	jr .okay
 
-.player_turn
-	ld a, ANIM_OBJ_ENEMYHEADFOLLOW
+.player_side
+	ld a, ANIM_OBJ_PLAYERHEAD_2ROW
 	ld [wBattleObjectTempID], a
 	ld a, 6 * TILE_WIDTH
 .okay
@@ -516,12 +516,12 @@ BattleBGEffect_HeadFollow:
 	call BattleBGEffects_IncrementJumptable
 	push bc
 	call BGEffect_CheckBattleTurn
-	jr nz, .player_turn_2
+	jr nz, .player_side_2
 	hlcoord 12, 5
 	lb bc, 2, 7
 	jr .okay2
 
-.player_turn_2
+.player_side_2
 	hlcoord 2, 6
 	lb bc, 2, 6
 .okay2

engine/battle_anims/helpers.asm

@@ -100,7 +100,7 @@ GetBattleAnimOAMPointer:
 	add hl, de
 	ret
 
-LoadBattleAnimObj:
+LoadBattleAnimGFX:
 	push hl
 	ld l, a
 	ld h, 0