Automated tests, session caching, place API, cleanup

Automated tests, session caching, place API, cleanup

    Testing & CI:
    - d78b16e working coverage (28% only for now)
    - c9b9d7b add more unit tests
    - 527b685 add pytest and coverage targets
    - a6d07c4 beef up GitHub action
    - 3bf4ae8 fix Windows encoding error
    - 0ff93da fix macOS runner
    - 92d4f98 add .envrc for direnv

    Linting:
    - 62e1cd0 add ruff, black; format code in CI
    - 78f1f38 isort & black agree

    Features:
    - dc77f9f CACHE: add cache-control opt (conditional requests)
    - 21fdb59 working headless automation for evading bot-detection
    - 2b8f110 add geocoder to requirements

    Other contributors' work included:
    - @jadsongmatos: requests_cache HTTP caching
    - @bsudy: FS IDs, request caching, Geonames place API, Gramps XML export [alpha]
    - @josemando: requests-ratelimiter (rate limiting)

    Co-authored-by: jadsongmatos <jadsongmatos@users.noreply.github.com>
    Co-authored-by: Barnabás Südy <bsudy@users.noreply.github.com>
    Co-authored-by: Josemando Sobral <josemando@gmail.com>
Signed-off-by: Shane Jaroch <chown_tee@proton.me>