Add autonaming functionality for objects whose name can be derived from their text

• PushButtons, Labels, etc.
• Provide some formatting dialog "%1className" where %1 is the latin1-excerpt of the text
• Do not interfere with names entered by the user

[Idea by Oswald, quite makes sense. Very often, Developers get
mockups from Designer with button1, button2..and those end up in the shipped product
by the rule "all prototypes intended for trash will become products one day".]