Fix 1.6.28 — Gunsmith Simulator Steam update #1077375

Prone position: fix exiting via ESC menu causing ammo to show through ammo box, secondary position no longer shows "lie down" hint before its placed. Testing: free testing after tests are done fix potential crash if the gun is taken to shooting range after free testing, fix hints not showing correctly, fix m249 interactivity and incorrect condition for shoulder test. Barrel overheat applied to older guns where appropriate, very hot barrel visibly glows red. Localization: added information on actions connected to flashlight and start minigame, fix stg44 parts with identical names. Fix bugs in certain situation with safe and photo area. Fixes when trying to put multiple parts some of which may be identical. It's now possible to "look for more jobs" on the bottom of contracts list to get new set of available contracts if player progression is on grenade launchers.