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/eyeglint_ps2x.fxc

@@ -0,0 +1,32 @@
+// ======= Copyright © 1996-2007, Valve Corporation, All rights reserved. ======
+//
+// Run procedural glint generation inner loop in pixel shader (ps_2_0)
+//
+// =============================================================================
+
+struct PS_INPUT
+{
+	float2 tc			: TEXCOORD0;	// Interpolated coordinate of current texel
+	float2 glintCenter	: TEXCOORD1;	// Uniform value containing center of glint
+	float3 glintColor	: TEXCOORD2;	// Uniform value of color of glint
+};
+
+float GlintGaussSpotCoefficient( float2 d )
+{
+	return saturate( exp( -25.0f * dot(d, d) ) );
+}
+
+float4 main( PS_INPUT i ) : COLOR
+{
+	float2 uv = i.tc - i.glintCenter;	// This texel relative to glint center
+
+	float intensity =	GlintGaussSpotCoefficient( uv + float2(-0.25f, -0.25f) ) + 
+						GlintGaussSpotCoefficient( uv + float2( 0.25f, -0.25f) ) + 
+					5 * GlintGaussSpotCoefficient( uv ) + 
+						GlintGaussSpotCoefficient( uv + float2(-0.25f,  0.25f) ) + 
+						GlintGaussSpotCoefficient( uv + float2( 0.25f,  0.25f) );
+			
+	intensity *= 4.0f/9.0f;
+
+	return float4( intensity * i.glintColor, 1.0f );
+}