add support for HLSL/FX

Add support for DirectX HLSL / FX files. The FX files are
just HLSL files with some additional syntax to set
render-states and define multiple shader stages in one file.

Samples are either written by me, or taken from Chromium.

samples/HLSL/noise.fx

@@ -0,0 +1,41 @@
+float alpha = 1.f;
+
+texture tex;
+sampler tex_sampler = sampler_state
+{
+	Texture = (tex);
+	MipFilter = LINEAR;
+	MinFilter = LINEAR;
+	MagFilter = LINEAR;
+	
+	AddressU = WRAP;
+	AddressV = WRAP;
+};
+
+struct VS_OUTPUT
+{
+	float4 pos  : POSITION;
+	float2 tex  : TEXCOORD1;
+};
+
+VS_OUTPUT vertex(float4 ipos : POSITION, float2 tex  : TEXCOORD0)
+{
+	VS_OUTPUT Out;
+	Out.pos = ipos;
+	Out.tex = tex * 2;
+	return Out;
+}
+
+float4 pixel(VS_OUTPUT In) : COLOR
+{
+	return tex2D(tex_sampler, In.tex) * alpha;
+}
+
+technique blur_ps_vs_2_0
+{
+	pass P0
+	{
+		VertexShader = compile vs_2_0 vertex();
+		PixelShader  = compile ps_2_0 pixel();
+	}
+}