[TASK] Introducing sophisticated Highlighter configuration domain
[TASK] Refactoring Flexform DO for Highlighter Configuration usage
[TASK] Refactoring LanguageItems Flexform itemsFunc processor for Highligher Configuration usage
[TASK] Fixing TYPO3.CMS CGLs (elseif)
[TASK] Cleaning up Configuration structure; fixing LanguageItems Configuration instance creation
[TASK] Refactoring of fail safe brush alias retrieval
[FIX] skipping `plain` brushes
[FIX] Retrieving extension settings instead of full TS
[FIX] Fixing strtolower() call within Flexform LanguageItems procFunc
Revert "[FIX] Retrieving extension settings instead of full TS"

This reverts commit b847814a4afc685c25df5dca4278fa38243eb1af.
[FIX] removal of empty lines within Highlighter Configuration