[MRELEASE-1101] Completely revise argument(s) handling

**[Michael Osipov](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=michael-o)** opened **[MRELEASE-1101](https://issues.apache.org/jira/browse/MRELEASE-1101?redirect=false)** and commented

Currently, we have multiple parameters which accept goals, args, options, etc. They suffer from several problems:
* They accept everything and don't reject. E.g., goals should accepts goals only which is not the case.
* It accepts one arg line and internally parses it.

Both is wrong:
* We need exactly **one** config element `` which take everything what forked Maven shall receive
* We do double, brittle parsing. It must be one arg at a time, therefore a single string must be rather a array/list of args.

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**Affects:** 3.0.0-M6

No files, tests, or entry points are named. Start by tracing the plugin parameters that accept goals, arguments, and options, then follow how arguments reach the forked Maven invocation. Done means one configuration supplies a list of individual arguments without additional parsing or accepting unrelated values.

Written by the indexing model from the issue text.