Mission: Add support for auto-finishing missions.

By adding a Takeoff and RTL to the mission.
Android: If uploading a mission without Takeoff and RTL ask the user if he wants to append this data.
Android: Add a better Dialog for the mission upload
Mission: Make mission UPDATE events refresh the mission on the map
Merge branch 'master' of https://github.com/DroidPlanner/droidplanner into missionHelp
fixed issue with PR #1142.
Added option to disable dialog showing.
Merge branch 'master' of https://github.com/DroidPlanner/droidplanner into missionHelp
Merge pull request #1142 from DroidPlanner/missionHelp

Mission assistant
Merge branch 'master' into building_mapper