OAF File Upload

I tried to utilize an attachment image component as an attempt to work on a file upload function (because of the word "attachment") but failed miserably XDww Second attempt was with messageFileUpload component and yeah I finally got it right this time.

The only thing you need to take note is to link the component with a ViewObject attribute - which value will be used as a reference to retrieve the file for later viewing.

A null reference value will render the textfield + browse button combo, while a non-null value will render a view hyperlink and a clear button (which removes the reference value from the attribute)

TODO: clarify internal mecha / tables related.