Dunamai

* Added Fossil support.
* Fixed case with Git/Mercurial/Subversion/Bazaar where, if you checked out an
older commit, then Dunamai would consider tags for commits both before and
after the commit that was checked out. It now only considers tags for the
checked out commit or one of its ancestors, making the results more
deterministic.
* Changed VCS detection to be based on the result of VCS commands rather than
looking for VCS-specific directories/files. This avoids the risk of false
positives and simplifies cases with inconsistent VCS files (e.g.,
Fossil uses `.fslckout` on Linux and `_FOSSIL_` on Windows)

* Fixed handling of annotated Git tags, which were previously ignored.

* Changed `Version.from_any_vcs` to accept the `tag_dir` argument,
which will only be used if Subversion is the detected VCS.
Likewise, `dunamai from any` now accepts `--tag-dir`.
* Added `Version.from_vcs` to make it easier for other tools to map from a
user's VCS configuration to the appropriate function.

* Fixed issue on Linux where shell commands were not interpreted correctly.

* Added Bazaar support.
* Added the `dunamai check` command and the corresponding `check_version`
function.
* Added the option to check just the latest tag or to keep checking tags
until a match is found. The default behavior is now to keep checking.
* Added enforcement of Semantic Versioning rule against numeric segments
with a leading zero.
* Renamed the `with_metadata` and `with_dirty` arguments of `Version.serialize`
to `metadata` and `dirty` respectively.
* Fixed the equality and ordering of `Version` to consider all attributes.
`dirty` and `commit` were ignored previously if neither `post` nor `dev`
were set, and `dirty=None` and `dirty=False` were not distinguished.

* Added Subversion support.
* Added support for the PVP style.
* Changed the type of the `style` argument in `Version.serialize`
from `str` to `Style`.