feat: Added ability to print globals as part of debug messages (#561)

Co-authored-by: Balloonpopper <balloonpopper@git.com>

game/rooms/room03/esc/button.esc

@@ -1,6 +1,8 @@
 :look
 say player "That button must activate the bridge, but it is broken." [r3_button_broken]
 say player "It should work now." [!r3_button_broken]
+# Demonstrate printing globals as part of debug messages
+debug "r3_button_broken is currently {r3_button_broken}"
 
 :push
 say player "I must USE this."