Pick Random User: merge v0.0.x into 0.1.x

There's a _large_ diff between 3.0 and 3.1/4.0's version of pick-random-user.
We should merge as it might improve/fix a bunch of things
See diff: https://github.com/bigbluebutton/bbb-plugin-pick-random-user/compare/v0.1.x...v0.0.x