browserpass: 2.0.22 -> 3.0.1

[infinisil]

Motivation for this change

This is a incompatible release, but I made this backwards compatible by including both the old and the new version in the package. People should already be able to update to this version, making the new version sit idly until the browser extension automatically updates in the following weeks, at which point the new version kicks in and the old one won't be needed anymore. Then we can remove v2 from the code.

As a consequence, this should be merged asap and backported to at least 19.03, such that the update gets to the channels before the browser extension auto-updates, otherwise it will break for everybody.

See browserpass/browserpass-native#31 as well

Something that needs to be updated yet is the home-manager module, ping @dermetfan

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size: 301MB -> 304MB
• Assured whether relevant documentation is up to date
• Fits CONTRIBUTING.md.

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[infinisil]

This needs to be backported, because as explained above, browserpass would just start to fail once the browser extension auto-updates. This is a preliminary fix if you will.

Backported to 19.03 in 7e889fe (and parent)
Backported to 18.09 in b791044 (and parent)