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/saffron_house.asm

@@ -1,4 +1,4 @@
-_SaffronHouse1Text1: ; a2305 (28:6305)
+_SaffronHouse1Text1:: ; a2305 (28:6305)
 	text "Thank you for"
 	line "writing. I hope"
 	cont "to see you soon!"
@@ -7,16 +7,16 @@ _SaffronHouse1Text1: ; a2305 (28:6305)
 	line "at my letter!"
 	done
 
-_SaffronHouse1Text2: ; a2352 (28:6352)
+_SaffronHouse1Text2:: ; a2352 (28:6352)
 	text "PIDGEY: Kurukkoo!@@"
 
-_SaffronHouse1Text3: ; a2366 (28:6366)
+_SaffronHouse1Text3:: ; a2366 (28:6366)
 	text "The COPYCAT is"
 	line "cute! I'm getting"
 	cont "her a # DOLL!"
 	done
 
-_SaffronHouse1Text4: ; a2395 (28:6395)
+_SaffronHouse1Text4:: ; a2395 (28:6395)
 	text "I was given a PP"
 	line "UP as a gift."