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.

mp/src/materialsystem/stdshaders/VertexLitGeneric_EnvmappedBumpmapV2_MultByAlpha_ps14.psh

@@ -0,0 +1,42 @@
+ps.1.4
+;------------------------------------------------------------------------------
+; Phase 1
+;------------------------------------------------------------------------------
+; Get the 3-vector from the normal map
+texld  r0, t0
+; Get environment matrix
+texcrd r1.rgb, t1
+texcrd r2.rgb, t2
+texcrd r3.rgb, t3
+; Normalize eye-ray vector through normalizer cube map
+texld  r4, t4                  ; <---- CUBE MAP here!!!
+;mov r0.rgba, r4
+
+; Transform normal
+dp3    r5.r, r1, r0_bx2
+dp3    r5.g, r2, r0_bx2
+dp3    r5.b, r3, r0_bx2
+; Reflection calculatiom
+dp3_x2 r3.rgb, r5, r4_bx2      ; 2(N.Eye)
+mul    r3.rgb, r5, r3          ; 2N(N.Eye)
+dp3    r2.rgb, r5, r5          ; N.N
+mad    r2.rgb, -r4_bx2, r2, r3 ; 2N(N.Eye) - Eye(N.N)
+; Alpha gets lost after phase marker, so store it here
+mov    r5, r0.a
+;------------------------------------------------------------------------------
+; Phase 2
+;------------------------------------------------------------------------------
+phase
+; Sample environment map
+texld	r3, r2
+; Result goes in output color (multiply by constant color c0)
+mul		r0.rgb, r3, c0
++mov	r0.a, c0.a
+
+mul		r1.rgb, r0, r0
+lrp		r0.rgb, c1, r1, r0 ; blend between color and color * color
+dp3		r1.rgb, r0, c3
+lrp		r0.rgb, c2, r0, r1 ; blend between color and greyscale
+
+; mult by alpha
+mul		r0.rgb, r0, r5