* AUTOPILOT.capabilities includes gimbal manager protocol bit
Sets MAV_PROTOCOL_CAPABILITY_COMPONENT_IMPLEMENTS_GIMBAL_MANAGER bit in AUTOPILOT.capabilities
* mavlink: update submodule
* mavlink: only set gimbal flag if gimbal param set
We should probably only set the flag if the gimbal manager is actually
set up using the MNT_MODE_IN parameter.
* mavlink: make param optional
If the gimbal module is not built in we don't have the MNT_MODE_IN
param, so we need to deal with that.
* gazebo-classic: update submodule
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Co-authored-by: Julian Oes <julian@oes.ch>