This PR fixes:

• Operations using the same resource model will now get unique PATCH operation IDs as long as their existing GET operations have unique IDs. This should easily handle any operation that can be split by casing.Split, e.g. get-foo, get_foo, getFoo, or GetFoo and turn it into patch-foo. If the operation doesn't start with a get or fetch, then we just prepend patch- to the existing operation ID.

Additionally:

• HTTP 415 responses are properly listed as returning application/problem+json like other errors
• PATCH operations now all have a default description set for documentation.

Existing tests continue to pass and provide coverage for the modified code.