Large Update clouds, controls, movable planets

* Movement now works w/ arrow keys as well
* Cloud textures/normal maps have been added and can be rendered
** with bugs, needs to work w/ atmo better
* Planets no longer have to be centered at origin, camera pos must be
passed as relative to their centers.
* Removed extraneous variables and functions from effects.
* Added new depth stencil state for use with clouds when they work.