LinkInterface and Vehicle uses mutexes to synchronize writing bytes to the link instead of queued signals

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

Set RC To Param support

Add support for chunked STATUSTEXT

Unit test for mission transfer error string checking

Add support for ArduRover MockLink

Support parameters from multiple components

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

* Flight modes still not implemented. Waiting on message change.
* Also includes various cauterization of UI things which should not be
available on high latency link.

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

Prevent shutdown ordering crashes

- Now responds to request_list using a worker routine to send out
params one at a time
- Support for failure modes for unit testing

- Delay gps position for better testing
- Longer delay on home position

This mechanism automatically queues data into the correct thread where necessary, otherwise the method is invoked directly with low overhead.

At the same time remove the UDP socket event workaround. It is not a problem.

Plus other auto connect bug fixes

- Pervasive change to automatically connect to known board types
- Lots of additional changes along with this:
- More exposure of objects/properties to Qml
- Much restructuring in LinkManager and LinkManager clients

- Pervasive change to automatically connect to known board types
- Lots of additional changes along with this:
- More exposure of objects/properties to Qml
- Much restructuring in LinkManager and LinkManager clients