Made sure to not show root node in GameLibrary since we wish to have several root nodes.
Added Events, Players and Date root nodes as default to the tree.
Added resources for GameLibraryVM
Some minor guy changes
Added dummy import method to ImportSGFUtil
Made sure to bind the GameCollectionVM to the GameCollectionView in MainWindow
Updated the binding for GameLibraryView for its tree
Added handling for game tree selection in GameLibraryVM
Added event listening for double clicks in the gameLibraryTree
Added TreeCellRendererModel to GameLibraryVM
Add binding for treecellrenderer to GameLibraryView
Added an icon for sgf files