changelist
- added brightness slider to settings menu
- fixed enemy over rotating arms to shoot at player from weird angles, now they're more inclined to rotate whole body and strafe
- fixed bug where enemy aim ik used incorrect gun aim target so pistol was shooting slightly off from player's position
- added bullet trails back in and slowed down enemy bullets a bit so they look like they're visibly moving in slomo instead of being way too fast to see
- fixed distortion effect on main menu not fading out until scaling is done causing it to look weird
- enabled gpu instancing for main menu distortion material
- added a small distortion bubble in the center of explosive barrel explosions
