Pdoc3

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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.

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- New support for PEP 484 Python type annotations.
- Class `__init__` methods are no longer documented separately.
Instead, class docstring now contains `__init__` method's docstring,
and class definition line now shows `__init__` parameters.
This is in line with Sphinx / Python stdlib documentation.
- PDF docs generation via Markdown, ingestible by various
Markdown-to-PDF converters.
- New module import mechanism with improved support for
namespace packages.
- CLI changes:
- New `--config` switch for easier setting of config.mako tunables.
- Deprecated switches in favor of new/standard ones:
- `--overwrite` → `-f, --force`
- `--html-dir` → `-o, --output-dir`
- `--html-no-source`, `--external-links` and `--link-prefix` are
removed in favor of new tunables settable with `--config`.
- `--output-dir` without `--html` outputs a tree of raw Markdown files.
- The semantics of module specified as filesystem path has changed:
before the full relative path was used to construct the python module
path, now only the basename is.
- Bugfixes regarding raw URLs and numpydoc transformations.

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- Bugfixes:
- Added support for metaclass subclasses.
- Fix pdoc.Function.params() error in case when keyword-only
parameters have no default values.
- Don't expand `os.environ` parameter default value as exposing it
is a security issue.

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- Only close standard input if `--close-stdin` is used. This flips
the previous (hopefully rarely required) default.
- Fix backslashes in relative `Doc.url()` on Windos.
- New support for `.. include::` reST directive that includes
verbatim content from another file.
- Dev web server (`--http`) fixes:
- Unify `--http` and non-`--http` behavior by always adding
cwd to `sys.path`.
- Fix favicon.ico errors in `--http` mode.
- HTML template:
- Make TOC reference lists two- or three-column only if enough room for it.
- Fix: Hyperlink raw URLs.
- New optional sorting of variables, functions, classes.
- New configurable Highlight.js style.

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- Add `__main__.py` so users can invoke `python -m pdoc`.
- Fix: List builtin class method descriptors
- Google docstring format fixes:
- Support for 2-space indents.
- Recognize sections even when not preceded by an empty line.
- Recognize additional characters (`,=[]`) in type specifications.
- HTML template fixes:
- Fixed some CSS typos.
- Re-styled View Source button in HTML template.
- Two-column TOC reference lists only when all names are short.
- TOC links for some class no longer lead to its ancestor class.