uart_esc: calculate raw PWM on the Snapdragon
uart_esc: calculate raw PWM on the Snapdragon

This includes taking care of the arming state and the limit ramp.

mcgill-robotics/Firmware,krbeverx/Firmware,Aerotenna/Firmware,krbeverx/Firmware,PX4/Firmware,Aerotenna/Firmware,dagar/Firmware,jlecoeur/Firmware,dagar/Firmware,krbeverx/Firmware,PX4/Firmware,krbeverx/Firmware,acfloria/Firmware,PX4/Firmware,dagar/Firmware,darknight-007/Firmware,jlecoeur/Firmware,jlecoeur/Firmware,krbeverx/Firmware,krbeverx/Firmware,dagar/Firmware,mje-nz/PX4-Firmware,mcgill-robotics/Firmware,darknight-007/Firmware,PX4/Firmware,mcgill-robotics/Firmware,dagar/Firmware,mcgill-robotics/Firmware,Aerotenna/Firmware,acfloria/Firmware,Aerotenna/Firmware,mje-nz/PX4-Firmware,jlecoeur/Firmware,Aerotenna/Firmware,PX4/Firmware,mcgill-robotics/Firmware,jlecoeur/Firmware,mje-nz/PX4-Firmware,jlecoeur/Firmware,darknight-007/Firmware,mje-nz/PX4-Firmware,PX4/Firmware,acfloria/Firmware,mcgill-robotics/Firmware,darknight-007/Firmware,PX4/Firmware,mcgill-robotics/Firmware,acfloria/Firmware,mje-nz/PX4-Firmware,darknight-007/Firmware,Aerotenna/Firmware,Aerotenna/Firmware,krbeverx/Firmware,acfloria/Firmware,jlecoeur/Firmware,jlecoeur/Firmware,mje-nz/PX4-Firmware,acfloria/Firmware,mje-nz/PX4-Firmware,dagar/Firmware,acfloria/Firmware,dagar/Firmware