worked on LoadPanel and AlbumArtPanel

The one size for all of the panels is now stored in the Streamline class
Created drag and drop listeners and button listeners for LoadPanel and
AlbumArtPanel
Drag and drop for LoadPanel and AlbumArtPanel working
JButton to open file chooser for LoadPanel and AlbumArtPanel working
JButton on AlbumArtPanel shows a scaled version of the selected album
artwork