[ADS-B] Add emitter category support & HTTP endpoint for retrieving ADS-B data #3428
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This PR adds the following:
Differentiated icons for light/small/large/heavy and similar aircraft types. This lets users differentiate a 747 from a C172 at a glance. Thanks to tar1090 for these sprites.
Instead of retaining different sprites per color, I'm instead coloring at runtime and caching to improve performance.
Before, all the same size/shape
After, with size/shape differences matching their size/shape
Type/Category readouts in the popover to make the size & type data more explicit.
In addition to the shape/size of the sprite changing, you can also explicitly read what type of aircraft you're looking at and its category.
An endpoint on the internal webserver at /adsb which serves Mission Planner's ADS-B data as JSON
This is extremely useful for external applications to understand local traffic. Whether you're using a MAVLink-connected ADS-B In receiver or the HTTP API support I recently added, you have a unified view of the same data your MAV & MP have.
Category support on ADSB_VEHICLE messages sent to the MAV
Previously the messages sent to the MAV didn't include the category (light, small, heavy) of the aircraft. Now it does.
Speech callouts for ADS-B Traffic at emergency proximities
When traffic is very close both horizontally and vertically, turning on the speech "ADS-B Alerts" checkbox in Planner settings will give a TCAS-style callout "Traffic: 4 O'Clock high; descend" every 5 seconds.