Always evaluated to false due to signed/unsigned

Delete of last link would cause crash. Need to check for -1 which
signals no selection in combo box.

Fixing -Wuninitialized

Fixing -Wuninitialized

Not sure what qmake # escape is. So fixed the problem instead.

Also fixed a number of other release build problems

Good example for usage of new mock uas interfaces and implementations.

Realized that I had configured my APM:Plane incorrectly since
FlightModeConfig was only set up to work with APM:Copter. Changed code
to respect mode switch channel parameter across all APM frame types.
Also a pile of other changes to make this code much more bullet proof
and correct. Implemented simple mode as well. Changed the style of the
code to be more data driven. This allows for adjusting for new param
values without needed to changing any code.

Good example for usage of new mock uas interfaces and implementations.

Realized that I had configured my APM:Plane incorrectly since
FlightModeConfig was only set up to work with APM:Copter. Changed code
to respect mode switch channel parameter across all APM frame types.
Also a pile of other changes to make this code much more bullet proof
and correct. Implemented simple mode as well. Changed the style of the
code to be more data driven. This allows for adjusting for new param
values without needed to changing any code.

Allows for testing of existence of lack of existence of signals coming
out of an object.

Allows for testing of existence of lack of existence of signals coming
out of an object.

Used for unit testing

This allows us to create mock version of the objects to use for unit
tests