Add scroll height indicators to Flickable

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

- Pervasive change to automatically connect to known board types
- Lots of additional changes along with this:
- More exposure of objects/properties to Qml
- Much restructuring in LinkManager and LinkManager clients

- Pervasive change to automatically connect to known board types
- Lots of additional changes along with this:
- More exposure of objects/properties to Qml
- Much restructuring in LinkManager and LinkManager clients

- Pervasive change to automatically connect to known board types
- Lots of additional changes along with this:
- More exposure of objects/properties to Qml
- Much restructuring in LinkManager and LinkManager clients

Plus lots of other tweaks to ui for visuals

Mostly accomplished by delay loading Qml elements

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

- Restructured a number of MissionItem properties as well

Can now scroll to work on laptops and tablets. Plus many other changes.

Everything is now based off of default font pixel size

- More more on making QGCView real
- Converted Parameter Editor to QGCView

Controls respect QGCPalette settings. Also added test window.