solving: #36

I can not have reproduce after I merged esdoc/esdoc#472

Can you close this PR?

Thank you for merging my changes @h13i32maru
This PR solves complex arguments in decorates, where the PR in the main project was just matching multiline arguments. Let me show you:
http://rubular.com/r/6UdWsNAQS1

You can see that the second decorator fails. This PR is intended to solve those complex argument. Do you need more information to replay this? LMK.

Summary:
multiline fix (in esdoc) complex argument fix (in esdoc-plugins)

Additional note: The DocBuilder.js @ line 701 (splitting operation) will fail when complex decorators are involved. No clue why, because no time to dig in. My fix for now:

//TODO: when not split by ':' prevent breaking. Assuming this has to do with decorators. No clue what this does
        if (tmp.length!=2) {
          return `${v}: null`;
        }

This changing breaks the behavior.
Please check 16560ff

'Foo#bar'.match(/(.*)[.#](.*)$/)
// => ["Foo#bar", "Foo", "bar", index: 0, input: "Foo#bar"]

'Foo#bar'.match(/(.*)[.#](?=.*\()(.*)$/)
// => null