Traffic

- New `.final()` operator, mirror of `.next()` d96fd9c
- Dependency issues for conda build deaed25

Dependency issue fix with pyOpenSSL

Minor release including:
- improvements in ground functions 05681c9
- improvements in startup time c83c825
- switch to poetry 3148a0f
- updates for pandas 1.3.0 430b321

Minor release including:
- caching lazy evaluations 4a49972
- missing lazy operators for `.bearing()` and `.diff()` 7579cdf
- serious improvements on Leaflet output (model for state vectors, airports, and more general highlighting capabilities) 45ffb03

Main changes since v2.5 include:

- Detection of events on ground (push back, parking positions, take off runway, etc.)
- Reconstruction of the most plausible flight plan (succession of waypoints)

Minor improvements:

- Support for CSV files downloaded from Flightradar24
- Download and parse METAR information
- Refactoring for altair visualisations
- Switch from cartotools to cartes package
- Many warning fixes
- Documentation improvements

Main changes since v2.4 include:
- Navigation events (runway alignment, runway changes, go-around, etc.)
- Support for flight phases from OpenAP
- Support for sliding windows
- Summary views for Traffic structures
- FlightIterator structures with proper representation and indexation
- Flight interaction with iterators through `has()/next()/sum()/all()`
- Flight support dynamic attributes, e.g. `altitude_max`
- Flight aggregation per window with `agg_time()`

Minor improvements:
- cartotools v.1.2.2 for better representations of airports
- More sample trajectories for documentation, gallery and testing
- Better API for leaflet on Flight and Traffic, popup windows
- Example gallery page
- Documentation improvements