Pywaterinfo

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- Switch local caching (32) to temporary os directory instead of project directory
- Extend example/documentation:
- Add example on how to request start/end date of a time series metadata (33)

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- Extend example/documentation:
- Add caching page to index of manual pages

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- Add local caching of API requests using the `requests-cache` package.
- Adjust root URL for HIC based API calls according to online documentation https://hicws.vlaanderen.be/.
- User can use custom time zone instead of UTC as default.
- Extend examples/documentation for specific:
- Limit the returned fields of `get_timeseries_value_layer` with `metadata=False`.
- Add example on how to request tide numbers for high/low tide data.

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Fix token handling for HIC data requests.

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Hot fix on token handling (Thanks to Erik Bollen for reporting).

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Add support for SSL certificate handling.