[File] [PATCH] Magdir/sf3 support for the Simple File Format Family of formats

[Yukari Hafner]

This patch adds magic/Magdir/sf3, which recognises the files as 
specified for the Simple File Format Family (SF3). The magic entries 
also parse out some of the files' fields for nicer output.

The SF3 specification can be found here: 
https://shirakumo.org/docs/sf3/specification
Along with sample files for testing here: 
https://shirakumo.org/projects/sf3/tree/master/samples/

One thing to note: file warns on file extensions with dots in them. For 
SF3 the canonical file extension has an extra prefix for each contained 
file type, such as: au.sf3, img.sf3, etc. I've set the file extension to 
just "sf3" for all of them now, but if in this case it would be better 
if the warning is ignored and the dotted extensions should be used 
instead, please let me know and I'll submit an updated patch.

Similarly, if there's cleaner ways to parse out some of the data 
(particularly the indirect reads as required for the model file 
confounded me for a while) please let me know.

Sincerely, Yukari Hafner

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