The `git blame` CLI offers a repeated `-C` option that can be used to detect
lines that move within/between files. While a slower operation, it yields more
accurate authorship reports.
https://git-scm.com/docs/git-blame#Documentation/git-blame.txt--Cltnumgt

While GitPython does enable passing custom kwargs to the command line `git`
invocation, the fact that kwargs is a dictionary (i.e. no duplicate keys) means
that there was no way to request the `-C` option in `git blame` more than once.

This commit adds an optional `rev_opts` parameter to the `blame` method which
accepts a list of strings to propagate to the CLI invocation of `git blame`. By
using a `List[str]` for `rev_opts`, users of GitPython can pass now the `-C`
option multiple times to get more detailed authorship reports from `git blame`.

docs: add typerror exception to active_branch method

fix: sphinx syntax

add author

That way people who use it won't be deterred, while it unifies style
everywhere.

Found via `codespell -q 3 -S ./git/ext/gitdb,./test/fixtures/reflog_master,./test/fixtures/diff_mode_only,./test/fixtures/reflog_HEAD`

This matches the signature from `Head.create`.

delete_head and Head.delete historically accept either Head objects
or a str name of a head.  Adjust the typing to match.  This
unfortunately requires suppressing type warnings in the signature of
RemoteReference.delete, since it inherits from Head but does not
accept str (since it needs access to the richer data of
RemoteReference).

Using assignment to make add an alias for create unfortunately
confuses mypy, since it loses track of the fact that it's a
classmethod and starts treating it like a staticmethod.  Replace
with a stub wrapper instead.