Tried to make shadows for trees too.

But having trouble with Texture2D_Arrays
Actually the 'z' and 'w' coordinates had to be swapped.
ShadowMap stack doesn't work.... by far...
Minimal changes.

Btw the multiple shadowmaps wasn't working because of a driver bug.
Small changes.
Added some missing files.
Delete terrain.geom
Fixed a perforamce issue.

The trees still don't have working shadows, but at least, it looks possible now...
Merge branch 'develop' of https://github.com/Tomius/LoD into develop
Tree shadows now actually work!
Merge branch 'develop'

Conflicts:
	shaders/terrain.frag