[Feature] Add Thingiverse as an External Source

[dullbenz]

Problem

The goal is to add a good number of external sources to give users a variety of results from different sources.

Description

In particular, Thingiverse is one such external source with free 3D design models that can be downloaded and used.
Adding Thingiverse as an external source to CC search will be a good addition and will benefit our users.

Implementation

• I would be interested in implementing this feature.

[dullbenz]

What caption text should we use to describe the content for Thingiverse. The site contains various 3D model designs.
Was thinking of using "Image" or "MODEL_3D" or "3D Model"

[PreciousOritsedere]

3D models sounds good

[dikehprosper]

“3D Model” is okay

[dullbenz]

I've run into a little issue with this task.

In effect, the problem is that in order to apply the "commercial purposes" and "modify, adapt ..." filters as indicated by the checkboxes in the picture below, I browsed the Thingiverse site and discovered that applying the "customizable" filter corresponds to "modify, adapt, ... " for CC search.

The problem is that, in order to implement "commercial purposes" filter for CC search, I thought about leveraging the license filters on Thingiverse, but selecting any of the licenses simply displays "NO Results" yet I actually verified and could see that there are items with these licenses.

[dullbenz]

I used the search param "&license=cc" (which on Thingiverse stands for the CC Attribution Licence) as the equivalent to the "use for commercial purposes" filter on "CC search".

Note that as I indicated in the previous comment, for now, the license filters on Thingiverse don't work and always return 0 results.