ObjectNameDialog:
  - Lets make it resizeable. Set a "width in chars" on the edit box to make it
    wide enough, that way we don't have to about setting a size request
    in pixels

ObjectTitleNameDialog
  - Lets make it resizeable, as above.
  - The original had a scrollbar, so added a scrolledwindow to it with
    always vertically scroll
  - For the textview to give it a default height, rather than using
    pixels I let it take its width by expand to the above edit widget width
  - For its height, added a non-translated text buffer with 5 blank lines
    and tweaked the ctor to set that as its permanent height request
  - GtkTextView maps to VclMultiLineEdit instead of "MultiLineEdit"
    its a corner case, they should be equivalent, so just changed
    MultiLineEdit to VclMultiLineEdit

NameDialog:
  - width requests as above
  - set name_entry as the mnemonic widget of name_entry

MessBox:
  - I set the label to be vertically centered for the resizeable case

Change-Id: I9ab9eb76aa64b4d7eaf1c9a738f9c29cd7f7820b