the "Sloppy" was always a bit .. unprecise.
removed SloppyFocus, SemiSloppyFocus and ClickToFocus options
added MouseFocus, ClickFocus, MouseTabFocus, ClickTabFocus
- MouseFocus - change the focus to the window under the mouse
(almost similar to the 'old' SloppyFocus)
- ClickFocus - change the focus to the window the user clicks
- MouseTabFocus - change active tabclient to the one under the
mouse in titlebar, does NOT change the focus
- ClickTabFocus - change active tabclient when clicked onto a
tabbutton
to achieve former SemiSloppyFocus behavior one needs MouseFocus and
ClickTabFocus
