DockbarX: Experimental Dockbar for Linux

DockbarX is a taskbar with grouping and group manipulation with some "experimental" features compared to Docbark (it is not a fork of Dockbar, but a branch of DockBar holding new "experimental" features).

"Experimental" features (Features that aren't in DockBar 0.21):
- New look for popups.
- Launchers
- Notifications for focused window on group button as well as on window button
- Minimize animation is aiming for the group button of the program.
- All mouse button actions are configurable
- Behavior when multiple workspaces or viewports are used are configurable
- Windows are raised on drag-and-drops
- "Opacify"