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_mart.asm

@@ -1,5 +1,5 @@
-_ViridianPokeCenterText2: ; 95ba1 (25:5ba1)
-_ViridianPokeCenterText1: ; 95ba1 (25:5ba1)
+_ViridianPokeCenterText2:: ; 95ba1 (25:5ba1)
+_ViridianPokeCenterText1:: ; 95ba1 (25:5ba1)
 	text "You can use that"
 	line "PC in the corner."
 
@@ -7,7 +7,7 @@ _ViridianPokeCenterText1: ; 95ba1 (25:5ba1)
 	line "told me. So kind!"
 	done
 
-_ViridianPokeCenterText3: ; 95be8 (25:5be8)
+_ViridianPokeCenterText3:: ; 95be8 (25:5be8)
 	text "There's a #MON"
 	line "CENTER in every"
 	cont "town ahead."
@@ -16,17 +16,17 @@ _ViridianPokeCenterText3: ; 95be8 (25:5be8)
 	line "any money either!"
 	done
 
-_ViridianMartText1: ; 95c36 (25:5c36)
+_ViridianMartText1:: ; 95c36 (25:5c36)
 	text "Okay! Say hi to"
 	line "PROF.OAK for me!"
 	done
 
-_ViridianMartText4: ; 95c58 (25:5c58)
+_ViridianMartText4:: ; 95c58 (25:5c58)
 	text "Hey! You came from"
 	line "PALLET TOWN?"
 	done
 
-ViridianMartParcelQuestText: ; 95c79 (25:5c79)
+ViridianMartParcelQuestText:: ; 95c79 (25:5c79)
 	text "You know PROF."
 	line "OAK, right?"
 
@@ -37,12 +37,12 @@ ViridianMartParcelQuestText: ; 95c79 (25:5c79)
 	para $52, " got"
 	line "OAK's PARCEL!@@"
 
-_ViridianMartText2: ; 95cd5 (25:5cd5)
+_ViridianMartText2:: ; 95cd5 (25:5cd5)
 	text "This shop sells"
 	line "many ANTIDOTEs."
 	done
 
-_ViridianMartText3: ; 95cf6 (25:5cf6)
+_ViridianMartText3:: ; 95cf6 (25:5cf6)
 	text "No! POTIONs are"
 	line "all sold out."
 	done