[TASK] creating flexform converter for ext:beautyofcode
[TASK] establishing content element DO
[TASK] switchting to content element DO within controller + templates
[BUGFIX] fixing method signature within type converter
[BUGFIX] fixing cObj data access
[TASK] adding uid/pid to mapping configuration
[BUGFIX] adding missing classes subkey to mapping configuration
[TASK] removal of property mapper
[TASK] switching to flexform object on-the-fly conversion

This is necessary, because the property mapper is only used for mapping
request data. The data mapper of extbase tries to validate the domain 
objects by looking into the DB. But a flexform has no identity and so this 
won't work.
[TASK] adding brush registry service to track used brushes on a page
[TASK] removal of brushes setting within SyntaxHighligher TS Setup
[TASK] introducing placeholder for PageRenderer pre-processing
[TASK] introducing PageRenderer hook for brush autoloading/-discovery
[TASK] removal of css/brush map for SyntaxHighlighter
[BUGFIX] trying to NOT add autoloader assets if *INT cObjs are on page
[BUGFIX] switching page id fetching
[BUGFIX] trying to prevent autoloader asset replacement if page id is not set
[BUGFIX] trying to not empty the brush registry data
[BUGFIX] moving brush registry cleanup into hook_feof of TSFE
[BUGFIX] fixing typo in hook registration