Support dropped game autosaves

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I think these are very similar to normal recorded game files, but with a bit of metadata prepended.

Start of the restore game data:

Start of header:

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Ohh. That's going to be a bit more difficult than I thought, perhaps, since the gzipped header doesn't always start with the 0xEC 0x7D 0x09 bytes. (The one in the screenshot doesn't, for example lol). There might be another length value in the file for the restore data, though.