add --apply to cherry-pick the result rather than logging it

[Fishrock123]

(also adds --bail to stop if a commit doesn’t apply rather than skipping
it)

Allows us to have branch-diff apply commits directly, rather than having to grab each hash and cherry pick it.

While range-cherry-picking worked for a while, it has become increasing difficult as we are ignoring more commits. This was the obvious approach from my point of view.

[rvagg]

I'd prefer to leave branch-diff as an output-only tool rather than an active player. Can we explore a -q option (or similar) to just print out commits to stdout so it can be piped to xargs git cherry-pick perhaps?

[Fishrock123]

Can we explore a -q option (or similar) to just print out commits to stdout so it can be piped to xargs git cherry-pick perhaps?

I guess? I didn't even know xargs existed, so this worked at the time. I'll leave this PR to you to decide what to do, and open a new one.

[rvagg]

gone with the other one, I likee