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/cinnabar_island.asm

@@ -1,33 +1,33 @@
-_CinnabarIslandText8: ; a61cf (29:61cf)
+_CinnabarIslandText8:: ; a61cf (29:61cf)
 	text "The door is"
 	line "locked..."
 	done
 
-_CinnabarIslandText1: ; a61e6 (29:61e6)
+_CinnabarIslandText1:: ; a61e6 (29:61e6)
 	text "CINNABAR GYM's"
 	line "BLAINE is an odd"
 	cont "man who has lived"
 	cont "here for decades."
 	done
 
-_CinnabarIslandText2: ; a622a (29:622a)
+_CinnabarIslandText2:: ; a622a (29:622a)
 	text "Scientists conduct"
 	line "experiments in"
 	cont "the burned out"
 	cont "building."
 	done
 
-_CinnabarIslandText3: ; a6266 (29:6266)
+_CinnabarIslandText3:: ; a6266 (29:6266)
 	text "CINNABAR ISLAND"
 	line "The Fiery Town of"
 	cont "Burning Desire"
 	done
 
-_CinnabarIslandText6: ; a6298 (29:6298)
+_CinnabarIslandText6:: ; a6298 (29:6298)
 	text "#MON LAB"
 	done
 
-_CinnabarIslandText7: ; a62a2 (29:62a2)
+_CinnabarIslandText7:: ; a62a2 (29:62a2)
 	text "CINNABAR ISLAND"
 	line "#MON GYM"
 	cont "LEADER: BLAINE"