Simulation button should be checkable

Without this, when you go to airframe config and the current config is
Simulation it will not be selected. Hence you won’t know what the
current config is.
Merge pull request #794 from DonLakeFlyer/SimConfigFix

Simulation button should be checkable
Finish removing MAVLink generation code.
This was deprecated on Febuary 3rd, 2014 and removed a little later. This finally completes that process.
Removed all dead code from MainWindow.
Includes removing an if-statement that should've been dead but was erronously applied to the following statement. Dead code = bad, if-statements without braces = bad.
Merge pull request #799 from Susurrus/dead_code_rem

Removed all dead code from MainWindow.
Remove unconnected view from QGC.
Both on the backend (replaced with DEFAULT view) and on the front end (removing UI menu items).
Merge branch 'master' of https://github.com/mavlink/qgroundcontrol into rem_mavgen

Conflicts:
	src/ui/MainWindow.cc
Merge pull request #798 from Susurrus/rem_mavgen

Finish removing MAVLink generation code.
Merge branch 'master' of https://github.com/mavlink/qgroundcontrol into rem_unconnected

Conflicts:
	src/ui/MainWindow.cc
Merge pull request #800 from Susurrus/rem_unconnected

Remove unconnected view from QGC.
Merge remote-tracking branch 'QGS_master_github/master' into dev_merge