More work on versioning

Settings versioning is handled at the uppermost level with a version
stamp.

Settings versioned independently from app version

Remove OpenSLL pre-req from readme

Remove SSL usage from code

Support transmitter modes for help (RC Cal)

correctly init argument list for fgfs on connection

remove unsupported control argument in call to fgfs

Verify board is unplugged before starting Firmware Upgrade

Remove TCPLink unit test

Generic mav ui incorrectly hidden

This test is too flaky to run in TeamCity reliably.

Cancel calibration re-enables Next button

Added workaround/bugfix for the acceleration calculation in X-Plane-HIL-...

Remove custom mode startup screen

Vehicle Config buttons not enabled correctly

Fix crash caused by buffer overrun

Remove test code from new version stuff

Fix broken master