Android: Fix typo
Android: Add a disarm button to the FlightActions fragment
Core: When disarming set the mode to LOITER

So the user can arm the copter via the tablet later, which is not possible if the copter is on LAND or RTL modes
Core: Move Takeoff code to GuidedPoint

Since it's part of the guided flight mode
Core: When doing a takeoff command update the internal fields of the Guided variable

Mainly the altitude should be set correctly.
Merge pull request #1099 from arthurbenemann/ActionButtons

Actions Buttons improvements: Tablet only flight
Core: Make ROI and Land insatiable via a Coord
Core: Helper Geo function to create a point along a line
Core: Implement a "dronie" generation tool
Core: Move "dronie" code to core, so it can be reused
Android: Added a dronie icon to FlightControl fragment
Android: Added "dronie" button to flight screen
Core: When a dronie is sent to the copter update the UI
Android: Make the UI update when the circle radius is changed in a mission
Merge pull request #1084 from arthurbenemann/dronie

Dronie
Merge pull request #1100 from arthurbenemann/CircleUI

Fix circle ui in  mission
Version: Releasing version 2.7.8
Merge branch 'master' of https://github.com/DroidPlanner/droidplanner into fix_issue_1093