patch/rebase: add rebase sub-cmd

Implement the :patch rebase command. Rebase the internal patch data in
case the repository was rebased too. The :patch rebase command accepts a
optional argument which is used as the reference commit from which the
rebasing will occur.

Open an editor with the commits that are found on top of the rebase
reference. Any untracked commit will have the tag 'untracked'. If a line
is removed or the 'untracked' tag remains, it will be dropped from the
internal data.

To group commits into a patch set, assign the same tag names.

Signed-off-by: Koni Marti <koni.marti@gmail.com>
Acked-by: Robin Jarry <robin@jarry.cc>

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