Makes the estate dialog fully functional. Implements all client facing functionality. Moves estate data from estate_settings.xml, which is used to provide defaults, to the region data store. Creates one estate for each region, and places the region in it. Converts all region bans to estate bans.
Patch 7 of the region patches. Finish off the region parts of the estate dialog. Full user functionality. Terrain textures, heights, water, avatar counts, prim bonus, debug settings and region toggles can now be set from the dialog on a per-region basis. Estate stuff defaults to sane values where there are no defaults, to estate_settings.xml otherwise. Sun still b0rked :(
Patch 5 in the region settings series. Adds a migration to ensure corrupted
data is purged and re-read from defaults. Some changes. Still no full
functionality
