[REQ] WACZ format support (zip alias)

[Shrinks99]

Is your feature request related to a problem? Please describe

WACZ is a spec for bundling web archive data stored as WARC files along with extra metadata and indexing information. It's also just a ZIP file, but many users don't innately know that, and as it gets adopted by more users (recently recommended by the Library of Congress and National Library of Norway) it would be great if the unarchiving tools that people already use are able to provide native support for it.

Describe the solution you'd like

Would be great if Keka could recognize WACZ as a supported format so they will uncompress when opened by the program instead of compressing? It's just a ZIP with a different name! Hopefully easy to add an alias :)

Describe alternatives you've considered

Everything currently works as expected if the user uses Keka's Finder extension to extract the WACZ's contents or if the default action is set to uncompress. This works, but not quite as user friendly as being able to double click the file, or use "Open With" in the right click menu and have it work by default.

[gingerbeardman]

See #84 New formats support

[aonez]

I'll take a look at it

[aonez]

I've added this one for v1.4.0.

Also the detection of the format when dropping files with unknown extensions has been improved to properly detect the format instead of relying on the extension. This will be limited to 10 or less files at once since it can have a performance impact with lots of files. This is very related to #1022 @gingerbeardman, since it also fixes that case.

[Shrinks99]

Nice! I saw your comment in the WACZ repo, will relay to the rest of the team, but no immediate answer at this time. :)

[Shrinks99]

Looks like this has been added, tested with the latest version and works as expected!

Thanks so much for doing this!