Shots Fired

Fixes a critical thread safety issue. S-F is now considered largely feature complete (in sole terms of what's possible with casing ejection, not in terms of scope of compatibility), except for a couple potential changes to allow for complex casing drops allowed by my upcoming mod Munitions Madness, though that won't be coming out for several months. Otherwise, development will ensure compatibility with the latest TACZ updates and features as best I can manage.