Create feature to filter known licenses by attributes

[krmoore]

As a new user of the site, it would be very helpful if there was a way to limit the list of licenses in the appendix based on license attributes (permissions/conditions/limitations), so that it's easier to compare all of the licenses that fit a user's criteria.

For example, if I wanted to see only licenses that had both the "disclose-source" condition AND NOT the "trademark-use" limitation, it would be great if there was a way to check a couple boxes and view only the licenses that fit that search.

I can see that this site is meant to simplify the process of choosing a license by keeping things very streamlined (which I really have appreciated). I also am not familiar enough with the framework for this site to know whether this feature is feasible (otherwise I would go ahead and start working on it).

[mlinksva]

I think this could be done/would be feasible without adding much in the way of visible UI elements to the appendix. One possibility previously mentioned at #528 (comment) -- toggle include all licenses/include only licenses with a given attribute/include only licenses without a given attribute -- by clicking on attribute column headers. This would need to be 100% client javascript.

[sebbes333]

Similar: #703
(For future readers)
(AHA! it automatically makes a link here when it's mentioned, smart! :)