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/lavender_mart.asm

@@ -1,4 +1,4 @@
-_LavenderMartText2: ; 9a104 (26:6104)
+_LavenderMartText2:: ; 9a104 (26:6104)
 	text "I'm searching for"
 	line "items that raise"
 	cont "the abilities of"
@@ -14,13 +14,13 @@ _LavenderMartText2: ; 9a104 (26:6104)
 	line "I can get them?"
 	done
 
-_UnnamedText_5c953: ; 9a1b4 (26:61b4)
+_UnnamedText_5c953:: ; 9a1b4 (26:61b4)
 	text "You know REVIVE?"
 	line "It revives any"
 	cont "fainted #MON!"
 	done
 
-_UnnamedText_5c958: ; 9a1e3 (26:61e3)
+_UnnamedText_5c958:: ; 9a1e3 (26:61e3)
 	text "I found a NUGGET"
 	line "in the mountains."