Removed UiLanguage as functionality can be achieved by a static method using an application context object. This avoids memory allocation for the creation of the UiLanguage object, and prevent possible leakage of Activity object, as only an application context is needed to make the config update.
Making progress toward integration of the navigation drawer within the app. UI is in place. Needs to tie functionality.
Navigation drawer ui completed. Needs to complete back end integration.
Renamed HUD to Attitude Indicator (AI)
Completed navigation drawer integration. Updated the app menu accordingly.
Turned the 'HelpActivity' abstract class into an interface. Help dialog is provider by 'org.droidplanner.activities.helpers.HelpDialogFragment'.
MissionItem: Removed unused fields in Takeoff and Land missionItems
MissionItem: Coded the pack and unpack methods of RTH, Land and Takeoff
MissionItem: Fix error in the pack method of RTH
Merge pull request #655 from arthurbenemann/MissionItem1

Fixing problems in MissionItems: Land, Takeoff, RTH
Version: Releasing version 2.2.1
Merge pull request #651 from zumbrunnen/renaming_hud

Renamed HUD to Attitude Indicator (AI)
Merge pull request #653 from ne0fhyk/feature_drawer_navigation

Feature: Integrate navigation drawer