Added support for the "Delete" key (delete a char at the right of the caret) (precedently only the "Backspace" key was implemented).
Enjoy.
PS : What about 1. caret positioning with the mouse and 2. selection with the mouse/shift+left/right arrows ?? I think it could all be solved easily : (just a naive approach I thought about quickly) just start from the extreme-left position of the textfield widget, then iterate each time by the width of each character until we get past the X position of the cursor. Then the last character we added the width is the one we want. I hope, this isn't too expensive but I can't think of a simpler (and faster) way for now.. Perhaps you know the Text2D implementation better than me, so just throw your ideas

EDIT : by "throw" I mean "write out on the forum"

, not "throw out" or "trash"
