Cleanup of capture view.
* Rename of capture view into tethering view
* Remove the never used concept of capture modes
* Additional cleanups
Merge pull request #426 from hean01/tethering_view

Cleanup of capture view.
Rename capture module to session.
Merge pull request #427 from hean01/master

Rename capture module to session.
Merge remote-tracking branch 'upstream/master' into scanner