Basic layout
CHG: MainWindow layout in basic form
ADD: Restoring old windows state (pos, size, maximized)
CHG: Shutdown now when MainWindow closes
ADD: SettingsWindow
ADD: Custom MessageBox (to be implemented further)
CHG: Plugin folder now referenced by Env Variable (must be set during install!)
CHG: libvlc* DLLs now referenced in app setting LibraryPath and set up with Utils.SetDllDirectory