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This code adds a simple endpoint to apply patches to repositories and branches on gitea. This is then used along with the conflicting checking code in #18004 to provide a basic implementation of cherry-pick revert. Now because the buttons necessary for cherry-pick and revert have required us to create a dropdown next to the Browse Source button I've also implemented Create Branch and Create Tag operations. Fix #3880 Fix #17986 Signed-off-by: Andrew Thornton <art27@cantab.net>