Pdoc

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- Fix circular imports and generally handling of typing annotations when
they are unresolvable (regression since 0.9.0).

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- New offline search function using Lunr.js (see `lunr_config` config tunable).
- Correctly enumerate members of `Enum` and typed-only namespaces.
- Inspect `__init__` to obtain true/overridden class instantiation parameters.
- Bump Highlight.js and use its 'python-repl' annotation for doctests.

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- Fix installation issue on non-UTF-8 platforms.
- Fix working with 'develop' installations in virtual environments.

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- Fix inline code interpretation inside fenced code blocks.

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- Fix extracting TOC with interleaved doctests in fenced code blocks,
regression since 0.8.2.

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- Enhancements:
- New CLI switch `--skip-errors` for skipping invalid/broken modules with
a warning instead of raising an error.
- CSS tweak to highlight :target-ed section.
- Paths to generated files (with `--output-dir`) are now printed to stdout.
- Support for `__docformat__` from PEP 258.
- Support for Python 3.8 positional-only arguments.
- Bugfixes:
- Better handle raw URLs and some markdown links.
- Consistently use `sort_identifiers` and variable type annotations in
markdown and PDF templates.
- Don't warn about missing key for `__pdoc__`-skipped submodules.
- Fix git path comparison and normalize `.. include::` paths on Windos.
- Fix sidebar scrollbar visible thrugh search results overlay.
- Avoid extracting doctest comments into HTML sidebar TOC.
- Support Google-style docstring multi-line Returns statement containing
description only.
- Support hyphens in Google-style docstring argument types.
- Fix hyperlinks for type annotations with spaces.
- Other:
- Bump HTML template CDN resources.
- Use non-breaking hyphen in return annotation arrow.
- Multi-line func/class signature in PDF template.
- Other minor docs improvements.