Major rework to support terrain profile display and terrain collision reporting

Use global palette

Active ROI indication in Plan Map items

Remove unused code

Better handling of invalid coordinates

More work on direction arrows

Also additional major Mission usability changes

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

Erros casused by all of the mergedd branches are now fixed for qgroundcontrol.pro. Working on fixing the errors that now appeare in qgcunittest.pro.

qgcunittest.pro now compiles and runs as long as run in terminal in projcts->Run Settings is unchecked.

Replaced the autopilot-specific inclusion of MAVLink to be more generic. Now if you have no actual QGC modifications to make and just want your messages to be available for viewing/logging you can just create the user_config.pri file and override MAVLINK_CONF.