- Alienswarm Depth_of field shader.
- Adding Env_dof_controller entity.
- Added $File in VPC scripts
Merge branch 'asw-shaders'

Conflicts:
	sp/src/lib/public/mathlib.lib
	sp/src/lib/public/tier1.lib
	sp/src/lib/public/vgui_controls.lib
	sp/src/materialsystem/stdshaders/stdshader_dx9_20b.txt