Traffic

Main changes since v2.2 include:
- FlightPlan parsing
- Eurocontrol B2B API
- Parsing ADDS-FAA Open Data
- New sources of open data for airports
- Cascade filtering as default arguments
- Access to extra tables with raw data from OpenSky database, thanks Wirden
- Cache expiration for better disk space management

Minor improvements:
- Empty Traffic and Flight are now treated as None
- Handling multiple sources of data for ATS routes, navaids
- Better handling of network proxies, thanks espinielli
- Better handling of corrupted cache files
- Improved plotting for airports/runways
- Reverse argument to Flight.cumulative_distance, thanks JarryGabriel
- Direct decoding from RTL-SDR and binary dumps thanks junzis espinielli

Bug fixes:
- Python 3.8, newer versions of numpy and pandas
- No more loop imports between core and data
- Memory leaks due to LRU cache

Main changes since v2.1 include:

- a more general `Traffic` indexation (slices, integers, etc.);
- facilities for computing and plotting wind fields;
- `Flight.agg_time()` to compute indicators on sliding windows, `Flight.distance()` now accepts airspaces and polygons;
- trajectory representations in notebooks are now simplified (resulting in lighter notebooks);
- access to more tables in OpenSky Impala; more general requests using airports for ADS-B and EHS, and using bounds for EHS messages (with associated documentation);
- decoding raw messages with pymodes now pass `bytes`, preparing for an optimised/compiled version of pymodes;
- a new plugin for [Kepler.gl](https://traffic-viz.github.io/plugins.html#kepler-gl);
- sources of data ordered by provider (faa, eurocontrol), with more parsing facilities

and various bugfixes

Main changes include:
- a lazy iteration mechanism,
- all timestamps are UTC by default,
- a refactored more uniform API across modules,
- a much faster download from OpenSky Impala shell,
- fast computation of closest points of approach,
- a fit/predict interface for clustering algorithms,
- a new robust plugin management system,
- new source of navigational database,
- embedded sample trajectories,
- and bug fixes.

Proper documentation and unit tests with coverage have been added

Performance, style and documentation improved
Bugs fixed

Simpler dependency management
Clean console tool
Query and decoding of EHS messages
Improved documentation and API