stop aliens abducting player's turn.
fixes for chryssalids.

they should no longer crash your game, and should now spawn enemies with
the correct armor and weapon.
large unit loftemps

let there be arrays!
- diagonal los distance fix
- 2x2 unit targeting fix (you can target any part)
that's per tile, not per unit.
better loftemp set for large units

this way they won't be seen through walls.