[WIP] [FEATURE] Add TYPO3-specific plugins for extensions and core

## Please do not merge yet!

This is simply a pull request to get your opinion about these plugins that I am making. In the TYPO3 world we currently lack a solid way to test code that does not involve complex Jenkins setups - PHPCI would be pretty useful at this, since it is PHP based and thus easy for TYPO3 users to get into.

Comments welcome - improvement suggestions, best practices etc.