correct dot marker name
add random error to uav scan

Use computeOffset to randomize uav scan error. Use a game logic instead
of spawn so that new thread has access to functions on same scope level.
Also fix bug relating to loading of parameters from description.ext.
fix rain sync
remove recon and engineer loadouts

Removed the recon sniper loadout, as the UAV scan feature deprecates its
gameplay role.

Removed the combat engineer loadout as this loadout was underutilized in
playtesting.