[DRAFT, WIP] PSR-5: PHPDoc Standard

This PR represents the current state of affairs with the PHPDoc Standard. Until this description and subject is altered this PR is considered a Work in Progress and not ready for a final review.

All feedback is welcome, please direct this to the PHP-FIG mailing list to prevent noise in this PR. This PSR covers so many subjects that unless the discussions are separated by topic that it will probably be quite impossible to follow in this PR.

I would also request that people open a thread per issue they would like to discuss and not combine several issues in a single mail; this will help to keep noise-levels down in discussions and for me to loook back or filter important information.

TODO items are tracked in the issue tracker for this PSR: https://github.com/phpDocumentor/fig-standards/issues
While it may not seem intuitive at first but the readability comes from adding patterns that your eyes get adjusted to; and which improves the speed with which a DocBlock can be skimmed.

The dollar sign is a clear indication of a variable and something which nests in the brain; you can skim a long DocBlock but whenever you encounter a dollar sign (which does not happen often) then your will automatically stop and register that.