FS#25 - Change sf::PostFx to a more general purpose pixel shader class (sf::Shader)

Updated the PostFx sample, renamed to Shader
Renamed all the static X::CanUseX() functions to X::IsAvailable() to make the API more consistent
Moved .def files from /build/VC200X to /src in CSFML
Minors fixes in CSFML

git-svn-id: https://sfml.svn.sourceforge.net/svnroot/sfml/branches/sfml2@1258 4e206d99-4929-0410-ac5d-dfc041789085

dotnet/samples/bin/datas/shader/wave.sfx

@@ -0,0 +1,12 @@
+uniform sampler2D texture;
+uniform sampler2D wave;
+uniform vec2 offset;
+
+void main()
+{
+	vec2 texoffset = texture2D(wave, (gl_TexCoord[0].xy * offset).xy);
+	texoffset -= vec2(0.5, 0.5);
+	texoffset *= 0.05;
+
+	gl_FragColor = texture2D(texture, gl_TexCoord[0].xy + texoffset) * gl_Color;
+}