Site Search Improvements

[televandalist]

Currently, site search lets you filter by everything, games, achievements, users, forums, or comments.

However, I think we should be able to filter "comments" by achievement comments, user wall comments, game wall comments, ticket comments, etc.

Additionally, a lot of newer comment sections are not searchable. This includes admin comments on user pages, dev comments on game pages, managehashes.php comments, manageclaims.php comments, etc. I think leaderboard comments, too?

Speaking of comments: #1056 :D

[Jamiras]

Handled in #1254