AP_HAL: New VRBRAIN board definition and libraries
mk: new make files for VRBRAIN
AP_Baro: new files for VRBRAIN board
AP_Common: new board ID for VRBRAIN
AP_Compass: new files and definition for VRBRAIN board
AP_Notify: new files and definitions for VRBRAIN board
AP_InertialSensor: new files and definitions for VRBRAIN board
DataFlash: added #ifdefs for VRBRAIN board
AP_BattMonitor: added #defines for VRBRAIN board
AP_BoardConfig: added #defines for VRBRAIN board
AP_NavEKF: added #defines for VRBRAIN board
AP_Relay: added #defines for VRBRAIN board
AP_Airspeed: added #defines for VRBRAIN board
AP_EPM: added #defines for VRBRAIN board
mk: new VRBRAIN board definition
Copter: added VRBRAIN board #includes and #defines
Plane: added VRBRAIN #defines and #includes
Rover: added VRBRAIN #defines and #includes
VRBRAIN: Added NuttX driver vroutput for PWM out

Modified script rc.APM to launch modules vrinput and vroutput
Modified startup scripts to run APM without SD
VRBRAIN: Added missing files. Added *.vbrain files to git ignore.