Introduce ALT+SHIFT for navigating the history w/o selecting and make ALT select the commits

Signed-off-by: Sven Strickroth <email@cs-ware.de>
Add jump to w/o selecting a commit to find dialog

Signed-off-by: Sven Strickroth <email@cs-ware.de>
Bind mouse back/forward buttons for navigating the history