[devtools] allow cross-origin requests for qunit
We have a mix of file:// html and http:// ajax calls. Which we should
at some point fix to all be http, but. Related to #4294727.
change_attribute_type('CWCache', 'timestamp', 'TZDatetime')
change_attribute_type('CWUser', 'last_login_time', 'TZDatetime')
change_attribute_type('CWSource', 'latest_retrieval', 'TZDatetime')
drop_attribute('CWSource', 'synchronizing')
add_attribute('CWSource', 'in_synchronization')