initial version of a local storage implementation which will use unique ...

...slugified filename on the local filesystem.

This implementation will only be enabled on windows based system to solve the issues around UTF-8 file names with php on windows.

@karlitschek @bartv2 @icewind1991 @danimo I need your in depth analysis of this solution. It's not yet final - but it shows the working concept.

Following unit tests are not working yet:
* Test\Files\Cache\Updater::*
* Test\Files\Cache\Watcher::testFileToFolder

@icewind1991 I need to ask you to take a look at this as well.