travis-ci linux tests

UT fixes and code fixes for found bugs

Plan: More major re-architecture

This time to handle correctly updating plan/fly view when plan changes

Plan: Survey gimbal

Plan: Sequential upload/down of individual managers

Plan supports transition from offline<->online without losing data

Progress bar for mission upload/download

Plan: Add back loading of older mission file formats

Make qgroundcontrol less error-prone for cloning behind corporate firewalls

Use a master controller for all Plan elements

Update the user model to a single controller instead of multiple

Disable UVC for iOS builds.

And fix build error…

Ui tweaks

Added a bit more separation between the Toolstrip and the Toolbar

Video sink sync

Configurable survey in from Settings/General page

Camera Feedback on Fly View