CursorIndex

It seems that QuickGUI::TextBox is missing a function to read the cursor index (QuickGUI svn rev 332). There is a setCursorIndex function, though.

May I ask for a getCursorIndex function to be added to TextBox?

Oops, forgot to add that in. I'm trying to wrap up Menu/ToolBar widgets, and I'll add this in after thats done.