update to the navigation drawer.
update to the Configuration activity structure.
Merge branch 'master' of https://github.com/DroidPlanner/droidplanner into fix_issue_1093
fixed remaining issues with the updated navigation drawer.
added compass icon.
updated the icon for the 'go to drone location' button.
Fixed issue with map centering on the editor screen.
closed issue #891.
updated flight action bar to reflect current flight mode.
fixed layout issues.
updated editor tools box.
fixed loss of spline state on screen rotation.
closed issue #1092
Merge pull request #1106 from ne0fhyk/fix_issue_1093

UI cleanup!