Feature cmake folders msvc
I added a cmake macro to display the files on msvc grouped by folders.
@moebius please test this on Visual studio version 2013, i was not able to test it since the installation on Krone crashes when opening the project files. Since i saw this behaviour already a few ays ago when @lyon wanted to compile something on the same machine, i assume there might be something broken or bad configured on Krone. ;)