Add zcia (compressed cia) file install support#2
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Adds support for installing zcia files. This files are compressed using zstd, which achieves a 20% average file compression (depends on the game/application). Install speed seems to be around 1.5MB/sec on my device (non-compressed is around 1.8MB/s).
So far only Azahar can compress cia files to zcia
The zstd library had to be added as a submodule in order to allow using the seekable format. While a 3ds portlib is provided by devKitPro, it lacks seekable support.
Remote zcia install will be implemented in a different PR.