Mir-git

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Added
^^^^^

- `save_worktree_and_branch()` context manager.
- `process_env()` function.
- `gitdir()` generic function.
- `worktree()` generic function.
- `GitEnvInterface` for dynamic checking of interface.

Changed
^^^^^^^

- `GitEnv` is now a named tuple.
- `git()` is no longer a generic function.
- `save_worktree()` no longer saves branch.

Fixed
^^^^^

- Work around bug in `git-stash`.

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Fixed
^^^^^

- Make `save_worktree()` raise an exception if any commands fail.

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Added
^^^^^

- Added `get_branches()`.
- Added `default_encoding`.

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Fixed
^^^^^

- Fixed `save_wortree()` printing to stdout/stderr.
- Use `stash create` to make `save_wortree()` more robust.

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Added
^^^^^

- `get_current_branch()`
- `save_branch()`
- `save_worktree()`

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Changed
^^^^^^^

- Fixed various links.
- `git()` now works with bytes and PathLike.