Get rid of globals.asm. Use ::s to export labels between objects.

globals.asm was a hack that:
- gave rgbasm an extra 100k lines to read
- increased reliance on the python preprocessor
- made the makefile a mess
- gave object creation an extra step
- wasn't even necessary

This speeds up build time by at least a third.

text/maps/celadon_house.asm

@@ -1,10 +1,10 @@
-_CeladonHouseText1: ; 9e0d5 (27:60d5)
+_CeladonHouseText1:: ; 9e0d5 (27:60d5)
 	text "Hehehe! The slots"
 	line "just reel in the"
 	cont "dough, big time!"
 	done
 
-_CeladonHouseText2: ; 9e10a (27:610a)
+_CeladonHouseText2:: ; 9e10a (27:610a)
 	text "CHIEF!"
 
 	para "We just shipped"
@@ -12,7 +12,7 @@ _CeladonHouseText2: ; 9e10a (27:610a)
 	cont "slot prizes!"
 	done
 
-_CeladonHouseText3: ; 9e13c (27:613c)
+_CeladonHouseText3:: ; 9e13c (27:613c)
 	text "Don't touch the"
 	line "poster at the"
 	cont "GAME CORNER!"