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/LightmappedGeneric_BumpmappedLightmap_blend_ps14.psh

@@ -0,0 +1,47 @@
+;------------------------------------------------------------------------------
+; Computes the diffuse component of lighting using lightmap + bumpmap
+; t0 - Normalmap
+; t1 - Lightmap1
+; t2 - Lightmap2
+; t3 - Lightmap3
+; t4 - Base1
+; t5 - Base2
+;
+; The texture coordinates need to be defined as follows:
+; tc0 - Normalmap and lightmap texture coordinates
+; c0, c1, c2 - Axes of the lightmap coordinate system in tangent space 
+;------------------------------------------------------------------------------
+ps.1.4
+
+; output = (lightmapColor[0] * ( ( N dot basis[0] )^2 ) + 
+;	       lightmapColor[1] * ( ( N dot basis[1] )^2 ) +
+;	       lightmapColor[2] * ( ( N dot basis[2] )^2 ) ) * lerp(base1, base2, lightmapColor[0].a)
+
+; Get the 3-vector from the normal map
+texld r0, t0
+
+dp3 r5.r, r0_bx2, c0
+dp3 r5.g, r0_bx2, c1
+dp3 r5.b, r0_bx2, c2
+mul	r5.rgb, r5, r5
+
+phase
+
+; Sample the lightmaps
+texld r1, t1 
+texld r2, t2 
+texld r3, t3 
+
+; Sample the base textures
+texld r4, t4
+texld r5, t5
+
+mul	r1, r1, r5.r
+mad r1, r2, r5.g, r1
+mad r1, r3, r5.g, r1
+
+; blend base textures
+lrp	r4, r4, r5, r1.a
+
+; assume overbright_2 !!!
+mul_x2 r0, r1, r4