v69 - bugfixes and "surprise" feature

Thanks again to blackjackGT for rigurous testing!

-fixed the map layout of some maps

-adjusted collision maps of the green tree blocks

-added a "surprise" feature, so when a unit didnt see the player before, it will now have a bit of a delay before shooting, to make those instant MG kills less likely. (might need further tweaking to make enemies not too weak)

-fixed the invisible Medipacs

-added a ping effect to grenades for better visibility and to medipac, when player can use a healing (is below its max hp).

This is a hotfix due to timeconstraints.