Enable rgbds warnings and remove CFLAGS=-O2 (default is now -O3)

engine/events/overworld.asm

@@ -750,13 +750,13 @@ Script_AskWaterfall:
 EscapeRopeFunction:
 	call FieldMoveJumptableReset
 	ld a, $1
-	jr dig_incave
+	jr EscapeRopeOrDig
 
 DigFunction:
 	call FieldMoveJumptableReset
 	ld a, $2
 
-dig_incave
+EscapeRopeOrDig:
 	ld [wBuffer2], a
 .loop
 	ld hl, .DigTable

engine/gfx/color.asm

@@ -241,21 +241,21 @@ LoadTrainerClassPaletteAsNthBGPal:
 	ld a, [wTrainerClass]
 	call GetTrainerPalettePointer
 	ld a, e
-	jr got_palette_pointer_8bd7
+	jr LoadNthMiddleBGPal
 
 LoadMonPaletteAsNthBGPal:
 	ld a, [wCurPartySpecies]
 	call _GetMonPalettePointer
 	ld a, e
 	bit 7, a
-	jr z, got_palette_pointer_8bd7
+	jr z, LoadNthMiddleBGPal
 	and $7f
 	inc hl
 	inc hl
 	inc hl
 	inc hl
 
-got_palette_pointer_8bd7
+LoadNthMiddleBGPal:
 	push hl
 	ld hl, wBGPals1
 	ld de, 1 palettes

engine/gfx/load_pics.asm

@@ -247,7 +247,7 @@ FixPicBank:
 ; This is a thing for some reason.
 
 PICS_FIX EQU $36
-GLOBAL PICS_FIX
+EXPORT PICS_FIX
 
 	push hl
 	push bc

engine/pokedex/pokedex.asm

@@ -16,7 +16,7 @@
 	const DEXSTATE_EXIT
 
 POKEDEX_SCX EQU 5
-GLOBAL POKEDEX_SCX
+EXPORT POKEDEX_SCX
 
 Pokedex:
 	ldh a, [hWX]