Improve CSS for Content, Statusbar and Activity

[posidron]

• [ ] Statusbar should have a little grid to place multiple status information inside.
• [ ] Content area should be scrollable, not the entire Window.
• [x] Activity table columns need to be more dense .. should happen automatically.
• [x] Activity tabs need to resize automatically to the max Content area minus Statusbar. If the pagination switches from 10 to 25 it places the pagination footer below the Statusbar.