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_3.asm

@@ -1,10 +1,10 @@
-_SafariZoneRestHouse3Text1: ; 85ad9 (21:5ad9)
+_SafariZoneRestHouse3Text1:: ; 85ad9 (21:5ad9)
 	text "How many did you"
 	line "catch? I'm bushed"
 	cont "from the work!"
 	done
 
-_SafariZoneRestHouse3Text2: ; 85b0b (21:5b0b)
+_SafariZoneRestHouse3Text2:: ; 85b0b (21:5b0b)
 	text "I caught a"
 	line "CHANSEY!"
 
@@ -12,7 +12,7 @@ _SafariZoneRestHouse3Text2: ; 85b0b (21:5b0b)
 	line "all worthwhile!"
 	done
 
-_SafariZoneRestHouse3Text3: ; 85b40 (21:5b40)
+_SafariZoneRestHouse3Text3:: ; 85b40 (21:5b40)
 	text "Whew! I'm tired"
 	line "from all the fun!"
 	done