Handle errors thrown inside plugins

[Twixes]

Currently if a plugin method throws an error, it will bubble up the server and get caught by Sentry (like this). We should logs these errors in a smarter way, so that they can be useful to plugin users and don't pollute our Sentry data.

[Twixes]

We probably should resolve #72 before and use that solution here too.

[mariusandra]

These errors do get captured via processError and stored on the plugin config table. #146 silenced them, so closing.

#72 is a separate topic and will definitely enhance error collection!