[WiP] - WinSW Extensions + SharedDirectoriesMapper

This is a dev. version of WinSW, which adds the extension mechanism to WinSW project.
The implementation has not been finished yet, but any comments will be useful.

Action items left:
* Implement Logger and pass it to extension methods
* Extend Unit tests
* Add license headers
* Revert MVS version before the merge
Garbage from the local "hack" implementation. All Map properties will be removed...