Modified some scripts to avoid FPS drop after long pause (to be tested deeper)

Corrected a bug due to new Apex laserDesignator

- corrected grenades behavior in houses
- group sitrep is relative to vehicle player, not player
- corrected position of the icon for the nearest enemy

V 3.3.8
Light modification taking into account some other mods with custom weapon sway.
UFN, you need to start with Stamina tuning set to "off" if you use another mod. All changes during game or another setting at start will overrun the foreign setting.

V 3.3.7
- added a letter below zeroing to remember what you are about to throw (G for grenade, S for smoke, L for chem light, F for manual flare)
- improved current weapon indication on zeroing (turrets, grenade launcher)
- modified sequence for adjusting fatigue with the load of the backpack (if overloaded) to avoid (most of the time) the "out of ammo" sentence.
(see RoyalDart30 comment)

Corrected a bug for difficulty setting on servers.