5e-Framework as add-on library

[shervin86]

I had a look at the new add-on library system for Maptool and I have the feeling that it would be really great to make the migration of the 5e-Framework to it. On of the clear advantages I see is that you can finally fully track with git all the changes and people can more easily contribute to it. I think that the effort payed in the migration will be soon compensated by community contributions.