[File] [PATCH] Magdir/games for Minetest schematics

[Alexandre IOOSS]

Hello,

I would like to propose a new signature for Minetest schematics.
It is compatible with all versions of Minetest schematic format.

```
$ file --magic-file games medium_house.mts nether_outpost.mts
medium_house.mts:   Minetest Schematic, version 4, size [8, 9, 12]
nether_outpost.mts: Minetest Schematic, version 4, size [13, 15, 13]
```

Attached, you will find the signature.

Best regards,

-- 
Alexandre
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