BBCode: Consolidate bb2html & bb2text + only convert ids in thread titles

Fixing bb2html to only convert ids would complicate options a lot,
adding a new formatting function to only convert ids would make sense,
but then all formatting functions kind of look alike, so I figured a
single bb_format() to support all use cases may be a better approach.

Trigger for this was that people do (understandably) put [spoiler] in
thread titles, and that should not be interpreted as the spoiler tag.

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