[CODE] Add a "Filter Scale" parameter to env_projectedtexture.

[celisej567]

I noticed that the state.m_flShadowFilterSize parameter can be different for different env_projectedtexture and I suggest adding the shadowfilter parameter and SetFilter Input to the env_projectedtexture.

Here is what needs to be changed to add this: https://github.com/celisej567/BCWSbase/commit/457fca845895aa5d019a1e51865309760df6a95b