Michael Eischer 4b957e7373 repository: Implement index/snapshot/lock compression ...

The config file is not compressed as it should remain readable by older
restic versions such that these can return a proper error.

As the old format for unpacked data does not include a version header,
make use of a trick: The old data is always encoded as JSON. Thus it can
only start with '{' or '['. For any other value the first byte indicates
a versioned format. The version is set to 2 for now. Then the zstd
compressed data follows.

2022-04-30 10:07:42 +02:00

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