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_metronome_room.asm

@@ -1,4 +1,4 @@
-_TM35PreReceiveText: ; a0f09 (28:4f09)
+_TM35PreReceiveText:: ; a0f09 (28:4f09)
 	text "Tch-tch-tch!"
 	line "I made a cool TM!"
 
@@ -6,13 +6,13 @@ _TM35PreReceiveText: ; a0f09 (28:4f09)
 	line "kinds of fun!"
 	prompt
 
-_ReceivedTM35Text: ; a0f48 (28:4f48)
+_ReceivedTM35Text:: ; a0f48 (28:4f48)
 	text $52, " received "
 	line "@"
 	TX_RAM $cf4b
 	text "!@@"
 
-_TM35ExplanationText: ; a0f5d (28:4f5d)
+_TM35ExplanationText:: ; a0f5d (28:4f5d)
 	text "Tch-tch-tch!"
 	line "That's the sound"
 	cont "of a METRONOME!"
@@ -23,18 +23,18 @@ _TM35ExplanationText: ; a0f5d (28:4f5d)
 	cont "it doesn't know!"
 	done
 
-_TM35NoRoomText: ; a0fc7 (28:4fc7)
+_TM35NoRoomText:: ; a0fc7 (28:4fc7)
 	text "Your pack is"
 	line "crammed full!"
 	done
 
-_Lab3Text2: ; a0fe3 (28:4fe3)
+_Lab3Text2:: ; a0fe3 (28:4fe3)
 	text "EEVEE can evolve"
 	line "into 1 of 3 kinds"
 	cont "of #MON."
 	done
 
-_Lab3Text3: ; a1010 (28:5010)
+_Lab3Text3:: ; a1010 (28:5010)
 	text "There's an e-mail"
 	line "message!"
 
@@ -58,7 +58,7 @@ _Lab3Text3: ; a1010 (28:5010)
 	para "..."
 	done
 
-_Lab3Text5: ; a10d8 (28:50d8)
+_Lab3Text5:: ; a10d8 (28:50d8)
 	text "An amber pipe!"
 	done