freertos: pristine import of FreeRTOS 7.4.2
freertos: Re-add our code for accessing the run time information
pios: changed all vPortYieldFromISR to portEND_SWITCHING_ISR
freertos stm32f1 heap1.c: readded xPortIncreaseHeapSize
pios sim: changed all vPortYieldFromISR to taskYIELD
GCS Documentation: update generation file to exclude external libraries
WaypointDialog: documentation update
TwoStep: remove unused calibration algorithm
PathPlanner: update documentation
PFD Gadget: update documentation
HITL Plugin: update documentation
WaypointEditor: update documentation
Notify Plugin: update documentation
MotionCapture: documentation updates
Map gadget: update documentation
UAVObjectWidgetUtils: update documentation
OSG Earth View: update documentation
Notify Plugin: update documentation
Quantec plugin: update documentation
Scope gadget: update documentation