/posts/:id/events: list is_resolved correctly for appeals. #2927
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Fixes an issue reported in https://danbooru.donmai.us/forum_topics/13831 ("Why are appeals made on deleted posts automatically resolved?"):
/posts/:id/events incorrectly lists appeals as always being resolved. This is because events UNION together appeals and flags, which doesn't quite work because for appeals is_resolved is a method, not an
attribute. is_resolved was hardcoded to true so it'd work in the UNION.
This changes PostEvent to be a wrapper object around PostFlag / PostAppeal, instead of a UNION. PostEvent delegates everything to the inner flag/appeals object, so that is_resolved works correctly.
Also, this incidentally fixes a problem with /posts/:id/event.xml not serializing correctly (see https://danbooru.donmai.us/posts/2651416/events.xml).