Extend eslint-config-standard

[tiborpilz]

To have a good set of base rules we can extend from, we could use eslint-config-standard (https://github.com/standard/eslint-config-standard), and adjust for our purposes as necessary. This would result in a much stricter linting config, so if adopted, we should publish this change with a new major version.

[frederik-b]

There are several things to keep in mind here:

• Not everyone needs a stricter set, not everyone needs a lax set, this will always be an opinionated compromise. Every project needs to tune the rules for themselves.
• If we base our rules on standard (see here https://standardjs.com/) we should check if we need to add, substract, or modify anything at all, or if we really just re-export their rules or just advice to use them and deprecate our package.
• There is so far no reason not to provide a lax and a strict set based on the default and the "standard" rules if there is an application for both.
• Not just we, but also our customers use these rules (which is why we open sourced them).