Added many shader source files

This should include the latest version of every shader that was in the
2007 SDK. It also includes a smattering of debug shaders, both VR
distortion shaders, and other assorted shaders that will hopefully be
useful.

None of these new files are included in the game shader DLL project. If
you need to modify one of these shaders for use in your mod you will
need to rename it so that you don't collide with the version of that
shader that lives in stdshader_dx9.dll.

sp/src/materialsystem/stdshaders/ShadowModel.psh

@@ -0,0 +1,22 @@
+ps.1.1
+
+;------------------------------------------------------------------------------
+; Draw a texture . . woo hoo!
+; t0 - texture
+;
+; The texture coordinates need to be defined as follows:
+; tc0 - texcoords
+;------------------------------------------------------------------------------
+
+def c0,1.0f, 1.0f, 1.0f, 1.0f
+
+tex t0		; shadow color
+texkill t1	; Clip
+texkill t2
+texkill t3	; backface cull
+
+; Darkening equation, compute a color = (shadow color * shadow alpha + 1- shadow alpha)
+;sub r1, t0, v0.a			; r1 = shadow alpha
+lrp r0.rgb, t0.a, v0, c0 +	; r0.rgb = (shadow color * shadow alpha + 1 - shadow alpha)
+mov r0.a, c0.a				; r0.a = 1
+