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/agatha.asm

@@ -1,4 +1,4 @@
-_AgathaBeforeBattleText: ; 8686b (21:686b)
+_AgathaBeforeBattleText:: ; 8686b (21:686b)
 	text "I am AGATHA of"
 	line "the ELITE FOUR!"
 
@@ -22,13 +22,13 @@ _AgathaBeforeBattleText: ; 8686b (21:686b)
 	cont "trainer fights!"
 	done
 
-_AgathaEndBattleText: ; 86970 (21:6970)
+_AgathaEndBattleText:: ; 86970 (21:6970)
 	text "Oh ho!"
 	line "You're something"
 	cont "special, child!"
 	prompt
 
-_AgathaAfterBattleText: ; 86998 (21:6998)
+_AgathaAfterBattleText:: ; 86998 (21:6998)
 	text "You win! I see"
 	line "what the old duff"
 	cont "sees in you now!"
@@ -38,7 +38,7 @@ _AgathaAfterBattleText: ; 86998 (21:6998)
 	cont "along now, child!"
 	done
 
-_AgathaText2: ; 869fd (21:69fd)
+_AgathaText2:: ; 869fd (21:69fd)
 	text "Someone's voice:"
 	line "Don't run away!"
 	done