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/route_4.asm

@@ -1,20 +1,20 @@
-_Route4Text1: ; 8db1e (23:5b1e)
+_Route4Text1:: ; 8db1e (23:5b1e)
 	text "Ouch! I tripped"
 	line "over a rocky"
 	cont "#MON, GEODUDE!"
 	done
 
-_Route4BattleText1: ; 8db4b (23:5b4b)
+_Route4BattleText1:: ; 8db4b (23:5b4b)
 	text "I came to get my"
 	line "mushroom #MON!"
 	done
 
-_Route4EndBattleText1: ; 8db6c (23:5b6c)
+_Route4EndBattleText1:: ; 8db6c (23:5b6c)
 	text "Oh! My cute"
 	line "mushroom #MON!"
 	prompt
 
-_Route4AfterBattleText1: ; 8db88 (23:5b88)
+_Route4AfterBattleText1:: ; 8db88 (23:5b88)
 	text "There might not"
 	line "be any more"
 	cont "mushrooms here."
@@ -23,12 +23,12 @@ _Route4AfterBattleText1: ; 8db88 (23:5b88)
 	line "them all."
 	done
 
-_Route4Text5: ; 8dbcd (23:5bcd)
+_Route4Text5:: ; 8dbcd (23:5bcd)
 	text "MT.MOON"
 	line "Tunnel Entrance"
 	done
 
-_Route4Text6: ; 8dbe6 (23:5be6)
+_Route4Text6:: ; 8dbe6 (23:5be6)
 	text "ROUTE 4"
 	line "MT.MOON -"
 	cont "CERULEAN CITY"