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/LightmappedGeneric_BaseTextureBlend.vsh

@@ -0,0 +1,43 @@
+vs.1.1
+
+# DYNAMIC: "DOWATERFOG"				"0..1"
+
+#include "macros.vsh"
+
+;------------------------------------------------------------------------------
+; Vertex blending
+;------------------------------------------------------------------------------
+
+&AllocateRegister( \$projPos );
+
+dp4 $projPos.x, $vPos, $cModelViewProj0
+dp4 $projPos.y, $vPos, $cModelViewProj1
+dp4 $projPos.z, $vPos, $cModelViewProj2
+dp4 $projPos.w, $vPos, $cModelViewProj3
+mov oPos, $projPos
+
+alloc $worldPos
+if( $DOWATERFOG == 1 )
+{
+	; Get the worldpos z component only since that's all we need for height fog
+	dp4 $worldPos.z, $vPos, $cModel2
+}
+&CalcFog( $worldPos, $projPos );
+free $worldPos
+
+&FreeRegister( \$projPos );
+
+;------------------------------------------------------------------------------
+; Texture coordinates
+;------------------------------------------------------------------------------
+
+dp4 oT0.x, $vTexCoord0, $SHADER_SPECIFIC_CONST_0
+dp4 oT0.y, $vTexCoord0, $SHADER_SPECIFIC_CONST_1
+
+dp4 oT1.x, $vTexCoord0, $SHADER_SPECIFIC_CONST_2
+dp4 oT1.y, $vTexCoord0, $SHADER_SPECIFIC_CONST_3
+
+mov oT2, $vTexCoord1
+
+; Now the basetexture/basetexture2 blend uses vertex color, so send it into the psh.
+mov oD0, $vColor