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/debugtangentspace_vs20.fxc

@@ -0,0 +1,55 @@
+// DYNAMIC: "COMPRESSED_VERTS"	"0..1"
+// DYNAMIC: "DOWATERFOG"		"0..1"
+// DYNAMIC: "SKINNING"			"0..1"
+
+#include "common_vs_fxc.h"
+
+static const int g_FogType	= DOWATERFOG;
+static const bool g_bSkinning		= SKINNING ? true : false;
+
+
+struct VS_INPUT
+{
+	float4 vPos				: POSITION;
+	float4 vBoneWeights		: BLENDWEIGHT;
+	float4 vBoneIndices		: BLENDINDICES;
+	float4 vNormal			: NORMAL;
+};
+
+struct VS_OUTPUT
+{
+	float4 vProjPos		: POSITION;
+	
+	float4 vDiffuse		: COLOR0;
+	
+	float4 fogFactorW	: COLOR1;
+
+#if !defined( _X360 )    
+	float  fog			: FOG;
+#endif
+};
+
+
+VS_OUTPUT main( const VS_INPUT v )
+{
+	VS_OUTPUT o = ( VS_OUTPUT )0;
+
+	float3 vObjNormal;
+	DecompressVertex_Normal( v.vNormal, vObjNormal );
+
+	float3 worldPos, worldNormal;
+	SkinPositionAndNormal( g_bSkinning, v.vPos, vObjNormal, v.vBoneWeights, v.vBoneIndices, worldPos, worldNormal );
+		
+	o.vProjPos = mul( float4( worldPos, 1 ), cViewProj );
+	
+	o.fogFactorW = CalcFog( worldPos, o.vProjPos, g_FogType );
+#if !defined( _X360 )
+	o.fog = o.fogFactorW;
+#endif
+
+	// stick the normal in the color channel
+	o.vDiffuse.rgb = worldNormal;
+	o.vDiffuse.a = 1.0f;
+	
+	return o;
+}