Add feature to allow a specific patch to fail

[peterjaap]

Is your feature request related to a problem? Please describe.
I have a patch that fails right now, but could pass in the future (due to circumstances not relevant to the case). I would like to have it fail now but succeed eventually.

Describe the solution you'd like
The option graceful has been added but this applies to the whole patch command. If I were to set graceful to true, all my other patches would also be allowed to fail, which I don't want.

Describe alternatives you've considered
Right now, I add @skip but that needs to removed when we upgrade the package and this is sometimes forgotten.

Additional context
I'd like to have a @graceful embedded meta-data field to allow a specific patch to fail without halting the entire patch command.