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_secret_house.asm

@@ -1,4 +1,4 @@
-_UnnamedText_4a350: ; 858a4 (21:58a4)
+_UnnamedText_4a350:: ; 858a4 (21:58a4)
 	text "Ah! Finally!"
 
 	para "You're the first"
@@ -14,13 +14,13 @@ _UnnamedText_4a350: ; 858a4 (21:58a4)
 	line "You have won!"
 	prompt
 
-_ReceivedHM03Text: ; 85943 (21:5943)
+_ReceivedHM03Text:: ; 85943 (21:5943)
 	text $52, " received"
 	line "@"
 	TX_RAM $cf4b
 	text "!@@"
 
-_HM03ExplanationText: ; 85957 (21:5957)
+_HM03ExplanationText:: ; 85957 (21:5957)
 	text "HM03 is SURF!"
 
 	para "#MON will be"
@@ -37,7 +37,7 @@ _HM03ExplanationText: ; 85957 (21:5957)
 	cont "fabulous prize!"
 	done
 
-_HM03NoRoomText: ; 85a02 (21:5a02)
+_HM03NoRoomText:: ; 85a02 (21:5a02)
 	text "You don't have"
 	line "room for this"
 	cont "fabulous prize!"