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_LightingOnly.vsh

@@ -0,0 +1,45 @@
+vs.1.1
+
+# DYNAMIC: "DOWATERFOG"				"0..1"
+
+#include "macros.vsh"
+
+;------------------------------------------------------------------------------
+;	 $SHADER_SPECIFIC_CONST_0-$SHADER_SPECIFIC_CONST_1 = Base texture transform
+;    $SHADER_SPECIFIC_CONST_2-$SHADER_SPECIFIC_CONST_3 = Mask texture transform
+;	 $SHADER_SPECIFIC_CONST_4	 = Modulation color 
+;------------------------------------------------------------------------------
+
+&AllocateRegister( \$projPos );
+
+; Transform position from object to projection space
+dp4 $projPos.x, $vPos, $cModelViewProj0
+dp4 $projPos.y, $vPos, $cModelViewProj1
+dp4 $projPos.z, $vPos, $cModelViewProj2
+dp4 $projPos.w, $vPos, $cModelViewProj3
+
+mov oPos, $projPos
+
+;------------------------------------------------------------------------------
+; Fog
+;------------------------------------------------------------------------------
+
+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 );
+
+; YUCK!  This is to make texcoords continuous for mat_softwaretl
+mov oT0, $cZero
+; Texture coordinates
+mov oT1, $vTexCoord1
+
+mov oD0, $cOne
+
+