Enable downloads on all browser

[ezzak]

This one was a doozy

1. For downloads: Where file picker is supported use it, otherwise fallback to using an anchor tag
2. Add the file picker approach to the new violations tab src/js/background/historyManager.ts
3. For downloading the local code: Do not pipe every file we grab through a compression stream, this makes it very difficult to combine these streams later on in a readable way, just clone the response and store it. src/js/content/contentUtils.ts
4. Collect all the chunks for the archive, put them in a ReadableStream, pipe it through a compression stream, and pipe it to writeable file handle steam. Before we were building a stream for every chunk and delimiter and trying to pipe them all together which is very hard to reason about src/js/content/downloadArchive.ts
5. Typescript version bump to support Response.getBytes()

Test all download functionalities on Chrome + Firefox

[rich-hansen]

Looks good to me!