WorldGuard

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This adds support for updating an existing region, so that if you have a long list of items in a set flag, such as deny-spawn you can add or remove items, rather than overwrite.

Think I would rather have a set syntax like + item,... and - item,... than the add/remove patterns. Works much better once we have piston set up with suggestions too, as +/- will appear at the top of the suggestion list before the possible values.

Also this should probably apply to MapFlag as well. Maybe we should abstract out AbstractCollectionFlag type?