[REVIEW REQUEST] Add userData property and properties map to TableColumn class

[Jonathan Giles]

Hi all,

A simple API addition request for your pondering today:

http://javafx-jira.kenai.com/browse/RT-20956

This RFE asks for the userData property to be added to TableColumn. 
userData is a property on Node, and in fact is just a shortcut to 
setting a property in the Node.properties map. Therefore, I would like 
to expose both userData and the properties map on TableColumn. I can see 
the value in adding this in, and there is a patch attached to the Jira 
issue above that adds this in.

This API has already been added to another 'non-control' (i.e. a class 
in the controls package that doesn't extend from Control, and thus Node) 
- the MenuItem class has both the userData property and the properties 
map. It could be argued that this should be against all controls that do 
not extend Control (including TableColumn, Tab, and the MenuItem classes 
from memory), but for now I'm taking it on a case-by-case base. I'm 
totally happen to be asked to add this API to Tab as well, if people 
want, as it is now the only outlier.

-- 
-- Jonathan