Hotfix 1.6.22

Prone position: fix exiting via ESC menu causing ammo to show through the ammo box, fix secondary position no longer shows "lie down" hint before it's placed.

Testing: in free testing after regular tests are done fix potential crash if the gun is taken to the shooting range and fix hints not showing correctly. Fix incorrect condition for the M249 shoulder test.

Barrel overheat applied to older guns where appropriate, a very hot barrel visibly glows red.

Localization: added information on actions connected to the controls for flashlight and start minigame.