Also hand carried text to speech changes from Stable to master. Plus
unit tests for that.

Need to hand carry some stuff from Stable to master in order to fix

This reverts commit ac73682a.

Fixed all the bugs the new tests found

This makes VehicleComponents reusable from core plugin without
requiring override of prerequisiteSetup

* enable TCPLinkTest
* enable FileManagerTest

Plus new unit tests

Also additional major Mission usability changes

Also turn on MavlinkLogTest