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/cinnabar_lab.asm

@@ -1,4 +1,4 @@
-_Lab1Text1: ; a0df7 (28:4df7)
+_Lab1Text1:: ; a0df7 (28:4df7)
 	text "We study #MON"
 	line "extensively here."
 
@@ -7,23 +7,23 @@ _Lab1Text1: ; a0df7 (28:4df7)
 	cont "for examination."
 	done
 
-_Lab1Text2: ; a0e49 (28:4e49)
+_Lab1Text2:: ; a0e49 (28:4e49)
 	text "A photo of the"
 	line "LAB's founder,"
 	cont "DR.FUJI!"
 	done
 
-_Lab1Text3: ; a0e70 (28:4e70)
+_Lab1Text3:: ; a0e70 (28:4e70)
 	text "#MON LAB"
 	line "Meeting Room"
 	done
 
-_Lab1Text4: ; a0e87 (28:4e87)
+_Lab1Text4:: ; a0e87 (28:4e87)
 	text "#MON LAB"
 	line "R-and-D Room"
 	done
 
-_Lab1Text5: ; a0e9e (28:4e9e)
+_Lab1Text5:: ; a0e9e (28:4e9e)
 	text "#MON LAB"
 	line "Testing Room"
 	done