Feliz Kaisertag, everyone!

Here's the quick rundown of the changes/fixes added to the game so far:

- Added a new weapon - the Sal'Chn Stun Staff! It's an AoE weapon that temporarily stuns enemies, giving you time to make space or switch to something more deadly.

- added proper custom buttons to (most) screens in the game.

- added sound effect for the objective buttons

- fixed closing doors playing their sound twice 

- fixed weapons being locked from switching if they failed to reload (this could be worked around by attempting to fire the weapon before but now it's fixed completely)

I'd also like to announce that Silicon Scars will most likely be coming out THIS year - if I can help it.