documented flags and misc. fixes

engine/menu/main_menu.asm

@@ -20,7 +20,7 @@ MainMenu: ; 5af2 (1:5af2)
 	ld [hli],a
 	ld [hli],a
 	ld [hl],a
-	ld [W_ANIMATIONID],a
+	ld [wDefaultMap],a
 	ld hl,wd72e
 	res 6,[hl]
 	call ClearScreen
@@ -269,7 +269,7 @@ LinkMenu: ; 5c0a (1:5c0a)
 	call DelayFrames
 	ld hl, wd732
 	res 1, [hl]
-	ld a, [W_ANIMATIONID]
+	ld a, [wDefaultMap]
 	ld [wDestinationMap], a
 	call SpecialWarpIn
 	ld c, 20

engine/menu/naming_screen.asm

@@ -166,7 +166,7 @@ DisplayNamingScreen: ; 6596 (1:6596)
 	call RunDefaultPaletteCommand
 	call GBPalNormal
 	xor a
-	ld [W_SUBANIMTRANSFORM], a
+	ld [wAnimCounter], a
 	ld hl, wd730
 	res 6, [hl]
 	ld a, [W_ISINBATTLE]

engine/menu/start_sub_menus.asm

@@ -160,7 +160,7 @@ StartMenu_Pokemon: ; 130a9 (4:70a9)
 .surf
 	bit 4,a ; does the player have the Soul Badge?
 	jp z,.newBadgeRequired
-	callba CheckForForcedBikeSurf
+	callba IsSurfingAllowed
 	ld hl,wd728
 	bit 1,[hl]
 	res 1,[hl]