Use pipeline_tools.utils.process_config_tree

Use pipeline_tools.utils.process_config_tree/.clean_config

• use in patch, baseline and brew triggers in {load/poll}_triggers

This will allow to simplify the trigger code and to refactor the trigger configurations to use

• defaults (.default) common to all configurations
• common base configurations (.extends) starting with a dot, that are (automatically) not used during triggering
• configurations entries starting with a dot that are used to check whether a configuration applies, but which are (automatically) not passed to the pipeline-code as trigger variables