Make ContentCompilerGui compatible to recent changes in pipeline and did
some usability changes.
Make the Visual Studio Extension work even if the ANX Framework is not
installed additionally..
Improve that the path for assembly refernces in a content project
doesn't get automatically updated, only if the reference is actually
saved, this is so you can specify a relative path yourself.
Fix missing icon for ContentProject when it was opened with Visual
Studio.
Made create_shaders.bat directly executable under windows by fixing the
directory separators.
