Fix RTL abort detection on stick change

Fix battery charge level filter

First release candidate for 1.3.0 release

Merge branch 'beta' into stable

- only use takeoff strategy when in auto mode

- after jumped takeoff set previous vel setpoint such
that thrust setpoint is continuous

Ensure that UAVCAN_ENABLE is always present

Travis CI: Next attempt at GCC fix

Fix spurious mission warning

removed jerk fix and reset prev horizontal vel sp with current velocity

Build fix and airspeed console cal