adding spinner wheel widget components.
MissionDetailFragment crash bug fix.
fixed compilation errors.
removed redundant linearlayout container.
cleaned file formatting.
settled on a style for the mission item number picker.
replaced the seekbar with the number picker.
cleaned up MissionWaypointFragment's layout and implementation.
cleaned layout resource for the MissionLandFragment.
updated formatting for the MissionLandFragment's layout resource.
updated MissionSplineWaypointFragment with the spinnerwheel widget.
updated MissionTakeoffFragment and MissionRegionOfInterestFragment with the spinnerwheel widget.
updated MissionLoiterTFragment with the spinnerwheel widget.
added `CardWheelHorizontalView` for better display of the spinner wheel.
layout resource cleanup.
added 'edit mode' rendering for the WheelHorizontalView widget.
specified 'windowSoftInputMode' for the 'EditorActivity' to avoid screen resize when the spinnerwheel closes the keyboard.
updating the mission detail fragment to make use of the 'CardWheelHorizontalView' widget.
Merge branch 'master' of https://github.com/DroidPlanner/droidplanner into fix_issue_1051
updated circle, spline, and normal waypoint with the CardWheelHorizontalView widget.
updated 'survey' and 'roi' with the CardWheelHorizontalView widget.
fixed handling of gestures with the parent container.
code cleanup.