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_5f.asm

@@ -1,4 +1,4 @@
-_CeladonMart5Text1: ; 9ddff (27:5dff)
+_CeladonMart5Text1:: ; 9ddff (27:5dff)
 	text "#MON ability"
 	line "enhancers can be"
 	cont "bought only here."
@@ -11,7 +11,7 @@ _CeladonMart5Text1: ; 9ddff (27:5dff)
 	line "increase SPEED."
 	done
 
-_CeladonMart5Text2: ; 9de79 (27:5e79)
+_CeladonMart5Text2:: ; 9de79 (27:5e79)
 	text "I'm here for"
 	line "#MON ability"
 	cont "enhancers."
@@ -23,7 +23,7 @@ _CeladonMart5Text2: ; 9de79 (27:5e79)
 	line "DEFENSE!"
 	done
 
-_CeladonMart5Text5: ; 9ded6 (27:5ed6)
+_CeladonMart5Text5:: ; 9ded6 (27:5ed6)
 	text "5F: DRUG STORE"
 	done