Add stub slots for all menu items

Naming of QActions was inconsistent wrt abbreviations - fixed.

Add stub slots for each action relying on connect by name.

Add qDebug() message to allow people to check that menu items fire
slots; not really necessary but may provide some reassurance as we build
familiarity with Qt.

Some changes to display text for menu items (e.g. Tree becomes View
All).

Signed-off-by: Amit Chaudhuri <amit.k.chaudhuri@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>