Support decoding iCloud backup LZFSE compressed files

[lfcnassif]

Seems iCloud backups (not supported by us officially) are using the LZFSE algorithm to compress the files, maybe we could add support to uncompress LZFSE. Below are some references:
https://github.com/lzfse/lzfse
https://github.com/horrorho/RagingMoose

[lfcnassif]

Integrating RangingMoose seems not hard. We would need LZFSE compressed samples to test, check if a signature exists to call the decompressor, for example, and test the decompression of course.

[lfcnassif]

Related: https://github.com/horrorho/InflatableDonkey

[lfcnassif]

Seems there is a 0x62 0x76 0x78 (little endian) header:
http://fileformats.archiveteam.org/wiki/LZFSE

At least for each block:
https://github.com/horrorho/RagingMoose/blob/master/src/main/java/com/github/horrorho/ragingmoose/LZFSEConstants.java#L40-L44

Confirmed near the beginning of their test file:
https://github.com/horrorho/RagingMoose/blob/master/src/test/resources/lzfse.test

So I'll wait for real iCloud backup samples to proceed...

[lfcnassif]

Since RagingMoose library is experimental and its author suggests using the reference lzfse implementation, after I get/receive more lzfse compressed samples, I'll compare the results with those from https://pypi.org/project/pyliblzfse/

If results disagree, we may switch to a python parser using pyliblzfse