Add asar support

[idleberg]

Since I'm unaware of any GUI tools that either compress or decompress asar, I would love to see support in my preferred archiver! It's the default compression format for Electron apps.

[Drovosek01]

For extract files from asar can use this utilities:
https://github.com/Zerthox/rasar
https://github.com/Lem/asar_extract
https://github.com/tylerlong/asar-extractor-app/releases

For me great work https://github.com/Lem/asar_extract
Mirror with compiled file
https://mega.nz/file/ALEUQTCI#nmRYyzXulNcip43wyCDTKmQtzgQSJTy2iokFCR9Kf5k

It would be cool if this extraction functionality was added to Keka

[aonez]

Sorry @idleberg for not replying. @Drovosek01 can you provide some asar compressed (and maybe uncompressed) samples?

[idleberg]

@aonez You can find a couple of asar files on https://github.com/search?q=path%3A*.asar&type=code&ref=advsearch

[probablykasper]

@aonez Here's an asar sample, including uncompressed version: asar sample ferrum.zip