BY defaut channels inherits parent configs
include_in_rss is always default to True
Fix get_content_filters to consider channel filters and channel_type filters
defined heritage method for channels
included a field to store Content model module.name useful for content_filters
themes should not repeat
defined heritage method for Content, and model_name + module_name props
base_filters in list_view to avoid override, also fix module_name
Populate create_configs and wipe it from fixtures