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/safari_zone_rest_house_4.asm

@@ -1,4 +1,4 @@
-_SafariZoneRestHouse4Text1: ; 85b62 (21:5b62)
+_SafariZoneRestHouse4Text1:: ; 85b62 (21:5b62)
 	text "You can keep any"
 	line "item you find on"
 	cont "the ground here."
@@ -9,14 +9,14 @@ _SafariZoneRestHouse4Text1: ; 85b62 (21:5b62)
 	cont "of them at once!"
 	done
 
-_SafariZoneRestHouse4Text2: ; 85bd5 (21:5bd5)
+_SafariZoneRestHouse4Text2:: ; 85bd5 (21:5bd5)
 	text "Go to the deepest"
 	line "part of the"
 	cont "SAFARI ZONE. You"
 	cont "will win a prize!"
 	done
 
-_SafariZoneRestHouse4Text3: ; 85c17 (21:5c17)
+_SafariZoneRestHouse4Text3:: ; 85c17 (21:5c17)
 	text "My EEVEE evolved"
 	line "into FLAREON!"