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/viridian_house.asm

@@ -1,4 +1,4 @@
-_ViridianHouseText1: ; 95d71 (25:5d71)
+_ViridianHouseText1:: ; 95d71 (25:5d71)
 	text "Coming up with"
 	line "nicknames is fun,"
 	cont "but hard."
@@ -8,16 +8,16 @@ _ViridianHouseText1: ; 95d71 (25:5d71)
 	cont "remember."
 	done
 
-_ViridianHouseText2: ; 95dc7 (25:5dc7)
+_ViridianHouseText2:: ; 95dc7 (25:5dc7)
 	text "My Daddy loves"
 	line "#MON too."
 	done
 
-_UnnamedText_1d5b1: ; 95de1 (25:5de1)
+_UnnamedText_1d5b1:: ; 95de1 (25:5de1)
 	text "SPEARY: Tetweet!"
 	done
 
-_ViridianHouseText4: ; 95df3 (25:5df3)
+_ViridianHouseText4:: ; 95df3 (25:5df3)
 	text "SPEAROW"
 	line "Name: SPEARY"
 	done