[TASK] Dependency handling in BrushRegistry; provided by BrushDiscovery
[TASK] Implementing registered brushes handling within Prism
[FIX] Fetching language by dedicated ::getLanguage() from Flexform
[FIX] Fixing TypoScript settings access; removal of unused ObjectManager
[FIX] AutoDiscovery for Plain brush; add to l10n catalogue
[TASK] Moving SyntaxHighlighter brush resource building into BrushLoader template
[TASK] Updating Unit tests