ENH: add shortcuts for module navigation

Per discussion on developer hangout, added a shortcut:

Cmd/Control+F : search for module

Then I decided to add these as well:

Cmd/Control+Left : previous module
Cmd/Control+Right : next module

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22077 3bd1e089-480b-0410-8dfb-8563597acbee