Allow unknown flight modes without warning

qobject_cast is times faster dynamic_cast for objects that
inherit QObject. also, use auto keyword to not duplicate
class names.

Instead of trying to keep a vehicle type within the FirmwarePlugin instance, pass the vehicle to the function so it can query the type that way.

Smart RTL support

Support STATUSTEXT_LONG

Remove the concept of reserved buttons for manual control

Add support for Orbit flight mode

Turn Orbit on

FirmwarePlugin: Issue a warning upon connecting if the firmware in use is not using a stable release

Turn off Orbit

Fix Change Command parameter default setting

Buggy and no longer needed

Remove/comment off debug output pollution

PX4 Firmware plugin: First try to switch flight mode, then arm if successful - which is a lot safer than arming and then seeing if we can switch modes.