Move osi.views.adapters.ToolAddables out of osi package

This is part of a series of tickets that will involve looking at various "customizations" that have been performed in the osi package for Karl3. Many of these are things that are probably more generally useful than just for osi and the hope is that many of these things can be moved into the karl or karl.content packages as appropriate. The idea here is to pare down to a bare minimum the amount of code that actually lives in the osi package so we can have a better idea of what customizations will be necessary for accomodating other pilots.

For each of these items there will be a judgment call in terms of assigning to one of these categories:

o It is truly a customization and should only ever live in the osi package.

o It is generally useful, should be part of core Karl and can be moved to either karl or karl.content.

o It is generally useful but has some small osi tweak and so should be refactored such that the really useful bits live in karl and osi has only a small tweak, either through configuration or subclassing or some other means.

The hope is most of these will be in the second category.

I'm not sure exactly what this is doing, but it doesn't smell like an OSI specific thing.

Another week, another milestone.

Hmm, I feel like this might actually be quite specific to OSI. This adapter simply says that a community can not have a forum, while an intranet can not have a wiki or blog. That seems like a specific policy that others will want to customize.