#95 [MyMusic] display folder structur

First of all it should be possible to display the folder structur of the "MyMusic" directory in the left window of the MyMusic window.

Some people organize there music files in the filesystem.
e.g. genre\artist\album\track.mp3

In the future it should be possible to set high customizable structurs in the left window. (display them by genre, or by year, etc)