Waypoints only mode tweaks

Hide ROI

Show camera section in waypoints only mode

Fix write storage permission problem

Fix GStreamer Debug positioning

Add internal error case

Default to ThrottleModeDownZero

Remove Split Polygon support since it causes crashes

Support for new AltitudeFactTextField

Make settingsGroup public for custom build overrides

Support STATUSTEXT_LONG

Move valueSetIsDistance to Fact so custom builds can override

Remove incorrect comment

Fix startup crash on initial font change signalling qgc reboot required

Keep track of recording time if camera doesn't provide it.
Make sure camera info is received (if camera ACKs the request)
Keep track of camera's heartbeat. Remove camera if not heard from after a while.
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