Also additional major Mission usability changes

Hamburger: Delete, Delete All, Show all Values

Hamburger: Delete, Delete All, Show all Values

- New mission command editor dialog
- New MissionCommands toolbox object to get command info
- Added APM mission item set

Also remove Move Up and Move Down support

Also much other cleanup/change

Plus more overall ui work

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

- Restructured a number of MissionItem properties as well