Extended symfony expression language support for TypoScript conditions

https://review.typo3.org/#/c/57787/

Including auto completion, in detail syntax checks and so on.

https://review.typo3.org/#/c/57787/29/typo3/sysext/core/Documentation/Changelog/master/Feature-85829-ImplementSymfonyExpressionLanguageForTypoScriptConditions.rst

Doku:

https://docs.typo3.org/m/typo3/reference-typoscript/master/en-us/Conditions/Index.html https://symfony.com/doc/4.1/components/expression_language.html https://symfony.com/doc/4.1/components/expression_language/syntax.html