- try to handle mavlink system validity and present checks more consistently
- telemetry_status unify heartbeats and healthy flags across MAV_TYPE and MAV_COMPONENT (once it's outside of mavlink we don't care about the difference)
- add gimbal
Instead of only keeping track of the sequence ID of specific "supported"
components, we now keep track of any sysid/compid of an incoming
message. Before this change, unknown components (such as jMAVSim) would
completely screw up the mavlink message stats and create confusion (at
least in my case).
With this change we currently keep track of up to 8 other components.
Once we reach the limit, we will print a warning.
* Add param for software flow ctl on 3DR radios
* Dont reset telemetry type on radio timeout
* Treat 3DR radio as generic link type
* Rename 3DR to SiK radio
