Feature request: allow user to select only relevant encodings while extracting

[dmitrylari]

Hi, thanks for making Keka, it's awesome!

Problem: when extracting, Keka asks user to choose the correct file name encoding (if it can't determine the right encoding itself). This list is very-very long and contains ALL possible encodings, even those I will never use in real life.

Suggestion:

1. please add a setting that allow user to choose most relevant encodings (in preferences), thus making the final list of encodins shorter and relevant.
2. Add a "default encoding" setting which Keka can use when it can't determine file encoding.

For example, some files that I came across are in Cyrillic DOS encoding, and it would be nice to be able to set it as "default-when-failed-to-detect" encoding.

So, basically, 99% of time the default encoding should be UTF-8 (or whichever is default on MacOS), and when it's not, then Keka could use this secondary "default-when-failed-to-detect" setting.

Thank you!