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/celadon_mansion_1f.asm

@@ -1,7 +1,7 @@
-_CeladonMansion1Text1: ; 9ceee (27:4eee)
+_CeladonMansion1Text1:: ; 9ceee (27:4eee)
 	text "MEOWTH: Meow!@@"
 
-_CeladonMansion1Text2: ; 9cefe (27:4efe)
+_CeladonMansion1Text2:: ; 9cefe (27:4efe)
 	text "My dear #MON"
 	line "keep me company."
 
@@ -9,15 +9,15 @@ _CeladonMansion1Text2: ; 9cefe (27:4efe)
 	line "money home!"
 	done
 
-_CeladonMansion1Text3: ; 9cf3c (27:4f3c)
+_CeladonMansion1Text3:: ; 9cf3c (27:4f3c)
 	text "CLEFAIRY: Pi"
 	line "pippippi!@@"
 
-_CeladonMansion1Text4: ; 9cf55 (27:4f55)
+_CeladonMansion1Text4:: ; 9cf55 (27:4f55)
 	text "NIDORAN: Kya"
 	line "kyaoo!@@"
 
-_CeladonMansion1Text5: ; 9cf6b (27:4f6b)
+_CeladonMansion1Text5:: ; 9cf6b (27:4f6b)
 	text "CELADON MANSION"
 	line "Manager's Suite"
 	done