TIKA-4225 -- add detection for amf

[tballison]

Thanks for your contribution to Apache Tika! Your help is appreciated!

Before opening the pull request, please verify that

• there is an open issue on the Tika issue tracker which describes the problem or the improvement. We cannot accept pull requests without an issue because the change wouldn't be listed in the release notes.
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[theobisproject]

This is the file ending for the OpenSCAD format. File ending for amf is *.amf

[tballison]

Too many tabs open. Fixed. Thank you.