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/reds_house_1f.asm

@@ -1,4 +1,4 @@
-_MomWakeUpText:
+_MomWakeUpText::
 	text "MOM: Right."
 	line "All boys leave"
 	cont "home some day."
@@ -9,13 +9,13 @@ _MomWakeUpText:
 	cont "for you."
 	done
 
-_MomHealText1:
+_MomHealText1::
 	text "MOM: ",$52,"!"
 	line "You should take a"
 	cont "quick rest."
 	prompt
 
-_MomHealText2:
+_MomHealText2::
 	text "MOM: Oh good!"
 	line "You and your"
 	cont "#MON are"
@@ -23,7 +23,7 @@ _MomHealText2:
 	cont "Take care now!"
 	done
 
-_StandByMeText:
+_StandByMeText::
 	text "There's a movie"
 	line "on TV. Four boys"
 	cont "are walking on"
@@ -32,7 +32,7 @@ _StandByMeText:
 	para "I better go too."
 	done
 
-_TVWrongSideText:
+_TVWrongSideText::
 	text "Oops, wrong side."
 	done