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/pallet_town.asm

@@ -1,8 +1,8 @@
-_OakAppearsText:
+_OakAppearsText::
 	text "OAK: Hey! Wait!"
 	line "Don't go out!@@"
 
-_OakWalksUpText:
+_OakWalksUpText::
 	text "OAK: It's unsafe!"
 	line "Wild #MON live"
 	cont "in tall grass!"
@@ -16,7 +16,7 @@ _OakWalksUpText:
 	line "me!"
 	done
 
-_PalletTownText2:
+_PalletTownText2::
 	text "I'm raising"
 	line "#MON too!"
 
@@ -25,7 +25,7 @@ _PalletTownText2:
 	cont "protect me!"
 	done
 
-_PalletTownText3:
+_PalletTownText3::
 	text "Technology is"
 	line "incredible!"
 
@@ -35,22 +35,22 @@ _PalletTownText3:
 	cont "data via PC!"
 	done
 
-_PalletTownText4:
+_PalletTownText4::
 	text "OAK #MON"
 	line "RESEARCH LAB"
 	done
 
-_PalletTownText5:
+_PalletTownText5::
 	text "PALLET TOWN"
 	line "Shades of your"
 	cont "journey await!"
 	done
 
-_PalletTownText6:
+_PalletTownText6::
 	text $52,"'s house "
 	done
 
-_PalletTownText7:
+_PalletTownText7::
 	text $53,"'s house "
 	done