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_dept_store_2f.asm

@@ -1,4 +1,4 @@
-_CeladonMart2Text3: ; 9c76b (27:476b)
+_CeladonMart2Text3:: ; 9c76b (27:476b)
 	text "SUPER REPEL keeps"
 	line "weak #MON at"
 	cont "bay..."
@@ -7,13 +7,13 @@ _CeladonMart2Text3: ; 9c76b (27:476b)
 	line "powerful REPEL!"
 	done
 
-_CeladonMart2Text4: ; 9c7b2 (27:47b2)
+_CeladonMart2Text4:: ; 9c7b2 (27:47b2)
 	text "For long outings,"
 	line "you should buy"
 	cont "REVIVE."
 	done
 
-_CeladonMart2Text5: ; 9c7dc (27:47dc)
+_CeladonMart2Text5:: ; 9c7dc (27:47dc)
 	text "Top Grade Items"
 	line "for Trainers!"