Remove HackFileShare-Folder / Add FullPath to interface

Remove the Folder HackFileShare.. why was this one there? :-)

I want to have FullPath to be on the IMvxFileStore interface. This is used to get the full path of files .

May have to find a better name for "FullPath".

Example: 
I want to extract a zip file I wrote to disk. For this I have to provide the full path to my zip-library.