Chessboard Renderer 2.0

#1052734: Move Chessboard filter code to separate module
#1104792: Implement hook_element_info() in chessboard.module
#91267: Request for X-FEN support

How about adding these to the mix?

2.x:
Add a chessboard formatter for textfield.
Add a chessboard widget for textfield with two form fields.

3.x:
Add a chessboard field.

EDIT: I've spent a little more time on this and feel we should go for our own field/ fields so we can easily decide what parts we want to re-use from text and which parts we definitely do not want to see. The motivation for starting out with building on text is that our current code base is close to text.

#1402020: Add a chessboard field