Note saving (#30)

* WIP note saving implementation

* Fix note saving affecting other files

* Prevent note collection in demo playback for safety

* Cache note saving enabled while in the lair or file select to prevent it changing in levels with notes

* Prevent "Grunty's magic" note dialog from being shown if note saving is enabled

* Implement dynamically spawned note saving

* Properly clear loaded save extension data when score status is cleared

* Hook up menu for note saving

patches/note_saving.h

@@ -0,0 +1,17 @@
+#ifndef __NOTE_SAVING_H__
+#define __NOTE_SAVING_H__
+
+#include "prop.h"
+
+void init_note_saving();
+void calculate_map_start_note_indices();
+
+// Notes are always saved, but this function controls whether to use the saved data to prevent notes from spawning and adjust the note score. 
+bool note_saving_enabled();
+
+void note_saving_on_map_load();
+void note_saving_update();
+void note_saving_handle_static_note(Cube *c, Prop *p);
+void note_saving_handle_dynamic_note(Actor *actor, ActorMarker *marker);
+
+#endif