VS2010 and VS2012 git management enhancements

Git ignore compiled, utility and user files for VS 2010 and VS 2012.
Git ignore changes made to OwlPatches submodule.
README update to reflect the current sources architecture.

close pingdynasty/OwlSim#11 (sorry for the 3 closing commits ^^ I
usually use SVN at work)
VS2010 PatchRegistry solution folder

Source/Patches VS filter content removed from OwlSim VS project.
All OwlPatches files added in PatchRegistry VS solution folder. They are
now visible and editable inside VS without interfering with VS
internal compilation process.
OwlSim VS project also cleaned and files were moved in the root VS
filter.
VS2012 PatchRegistry solution folder

Source/Patches VS filter content removed from OwlSim VS project.
All OwlPatches files added in PatchRegistry VS solution folder. They are
now visible and editable inside VS without interfering with VS
internal compilation process.
OwlSim VS project also cleaned and files were moved in the root VS
filter.
Merge pull request #13 from sgissinger/master

VS2012 & VS2010 solutions enhancements