Insignificant improvements.
Merged Preferences window fix from master.
Separated PlaybackComponent from MainWindow; added minimal history support; replaced Icons::Theme parameter with QIcon in PreferencesWindow.
Updated VenturousCore; improved history and playback implementation; started implementing safe blocking input; various small fixes.
Separated PlaylistComponent from MainWindow; improved blocking safety; added error messages; small fixes.
Separated PreferencesComponent from MainWindow; finished input blocking; removed PlaybackComponent's dependency on PlaylistComponent;
improved error checking; added debug output; improved comments.
Fixed grammar mistakes.
Improved handling icons.
Added playback actions; fixed icon installation path; small fixes.
Updated modules with fixed cctype functions usage; fixed HistoryWidget bug.
Added history actions to menu.
Improved preferences window UI.
Added option to show/hide status bar.
Fixed playlist tree performance issues.
Reduced max value of History maximum size in consideration of performance issue.
Updated user manual, README; fixed comments; set version to 0.9.