Also remove Move Up and Move Down support

Also fixed button and panel state transition bugs

This is to toggle off help view when clicking on items on the map and checking the appropriate buttons accordingly.

Also handling the toggling of the various panes on the right side of the screen to match the current selected task.

Adjusted icons so they no longer contain a background.
Added *Exclusive* functionality to the RoundButton element.
Added OnClicked signal for the drop down boxes so I could turn off Add Mission Item and Home Mode.

Also moving the Plan View tool bar buttons into a Row element.

Replacing some icons, cleaning up help text, etc.

Also:
- Remove unused code

Also understand the concept of missions which cannot be edited

Remove nigh load/save

Plus more overall ui work

- New MissionManager
- Plumb MissionManager through MissionEditor
- Mission Editor supports get/set

- Restructured a number of MissionItem properties as well