convert multi widgets data attributes in python

[benzkji]

use a config, for mapping multi widgets and other special cases.

for example the django-cms PageField:

CK...CONFIG = {'cms_page': '{cms_page_2}'}

[benzkji]

# a default, working with the provided contrib link_model
CKEDITOR_LINK_ATTR_MODIFIERS = getattr(
    settings,
    'CKEDITOR_LINK_ATTR_MODIFIERS', {
        'cms_page': '{cms_page_2}'
    }
)

[benzkji]

modifiers could also be callables, right, couldn't they?!