Sidebar Manager & Sidebar Permissions
A manager to house the settings for the existing sidebar blocks (as well as custom blocks in the future).
I think a separate database table is better than adding a bunch of new global settings that would take up memory on every page for no reason. We can also add the blocks' settings to the datastore and only load it on wiki pages.
It also allows us to simplify permissions for sidebar blocks since the blocks will have ID numbers.
Some blocks may be better to keep for certain usergroups only, like editors, while others might be suited for anyone. The Sidebar Manager should have its own Permissions section, which can be customized on a per-area basis.