mod_http_oauth2: Refactor client grant and response type checks Iterating over an array instead of creating a Set ought to create fewer short-lived tables. The arrays are usually very short so shouldn't be a performance issue. Moves validation earlier as to do less work before discovering that it can't proceed anyway.

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summary: Set process name to prosody
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This module sets the process name to `prosody` so it shows up as such
instead of `lua` in process management tools.

To use this module, you'll need the proctitle Lua library:
<https://github.com/hoelzro/lua-proctitle>