Added basic structure to GUI.
Moved pics,renaming, added some Implementation.

Moved pics from default package -> de.seishinryohosha.benzaiten.imgresource
Renamed de.speyer.seishinryohosha -> de.seishinryohosha.benzaiten

Implemented:
Open file Dialog.
Show/hide Controls.
Disabled basic functions on startup.
Play/Pause button.
Rewind button.