add shotgun behaviour

multiple projectile tracing and hit insertion
no multiple projectiles animation at this point, that would require far
too much alteration to deeply integrated code.
Don't forget the black bars!!
Merge pull request #779 from fenyo1/FixSoldierReorder

Fix: Incorrect up/down move of the mouse cursor on Soldier Reorder
Fix crash when mods are modding mods.
MODCEPTION