Support Custom Data for Components in Batch Update Via Profile

Custom Data update for components (Contribute, Events, etc) does not work for the respective Batch Updates.

A few additional notes:

• in my tests with Contribution batch update, custom fields rendered properly in the grid - but the values didn't save.
• i also included contribution "Source" in my profile and tried to update from the grid. These changes also were NOT SAVED - so there's some more general bugs in the update code.