Added triple layout PFD

Fix for layout glitch when using HIL Configuration, and added checks to see if there is an active UAS before attempting to connect HSIDisplay signals

Hotfix: Fixed widget / UAS initialization order which led to text messages (and other updates) being ignored if the widget was not open when the UAS was created

Added missing separater to Tool Widgets menu.

Changes for new calibration in APM 3.0 (Re: https://github.com/diydrones/MissionPlanner/issues/38), and change in some of the serial timeouts

Addition of requesting status updates from APM, if APM is in a state with no status updates, this will request them