Replace 'untar-js' library for exctract tar and .plg files with 'fflate'

[eddymonk]

Hello can please someone confirm that I can use 'fflate' to extract tar a plg files?

Right now im using https://github.com/InvokIT/js-untar but it's causing a lot of bugs, Does anyone have experience with it?

I really appreciate any help you can provide.