This is temporary until we get rid of it

All settings wired and persistent
Cleanup non Airmap builds

Move all airmap related stuff to its own directory

Add switch to QGCExternalLibs.pri to check whether 32bit or 64bit version of SDL should be used on windows

Even though it hasn't been supported forever, the files where still
being compiled

No signing support yet

This way QGC can support both PX4 and APM Flight Stack messages at the
same time.

Mostly accomplished by delay loading Qml elements

- Delete all old map code

- Local 3d View
- Custom Tool Widgets
- MockUAS/MockUASManager

Adding Issue #1157 to put back

This is the Pixhawk research board, not the PX4 production board.