Support preview and diffs of STL files

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Description

When it comes to 3D printing, the most widespread format is STL. It is used in personal, educational, and enterprise environments. Keeping thses files under Git repos is the easiest ways to store a 3d model that is shared and goes under multiple revisions. Use of this feature was publicized when NASA (a GitLab customer, according to your Facebook) published their 3D models on Github. This was covered by /r/3dprinting and hackaday, among others.

As a student who uses Git with STL files, this would make me among many others a happy user.

Proposal

• Implement preview of STL files ✅
• Implement external embed of STL files, a la GitHub
• Implement diffs of STL files

Links / references

• https://help.github.com/articles/3d-file-viewer/
• https://github.com/blog/1633-3d-file-diffs
• https://github.com/blog/1465-stl-file-viewing