some input-manager cleanups, vertical camera movement, rudimentary mouse button support
# simple scene :: ordnung muss sein! :hammer:
switch to cbuffer class in scene, camera reset on [R], sceene header cleanup
WindowResizing
* backbuffer gets updated on window resize
* same for camera aspect ratio
#FIX :: bugs getting in the way of depthbuffer usage
* depthbuffer was cleared with 0.0f
* DSClearFlags::BOTH was not handled
Merge remote-tracking branch 'Jan/master'

Conflicts:
	HDA_CG/Code/src/Scene.cpp