Pdoc

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- Fix regression bug introduced with HTML-escaping function parameters
default values in v0.6.4.

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- Better handling of descriptors.
- "Browse git" link pointing to e.g. GitHub added to documented identifiers
in HTML template. Controlled with new `git_link_template` config tunable.

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- New template tunable `syntax_highlighting=True` that controls whether
Highlight.js is included even if `show_source_code=False`.
- Fix `pdoc.Class.mro()` for types extending types with the same name.
- Support initializing `pdoc.Module` from module string.
- HTML-escape function parameter defaults so that objects' reprs don't
break HTML.
- Other small bug fixes.

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- New support for LaTeX math syntax (using new config tunable `latex_math=True`).
- Support for running system-site-installed pdoc within a virtual environment.
- Bugfixes.

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- Fixes:
- Don't generate Modules for empty namespace packages (i.e. resource directories).
- Generate real markdown files when `--output-dir` is set but not `--html`.
- Fix formatting of numpydoc type-only parameters.
- Auto-reload modules upon changes when in `--http` mode.
- New config tunable: `google_analytics`.
- Warn on unknown config tunables passed on the CLI.

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- Minor maintenance release.