[lazarus] CVS changes (Hint)

[Marc Weustink]

Hi,

Vincent Snijders and I made some changes to the hint code.
   + At initialisation of GTKObject a GTKTooltips is created.
     In the old situation this was done for every widget,
     however only one GTKTooltips is needed per application.
     This reduces lookups for gtk_get_data etc.

   + Hint text and visibility is updated through
     TInterfacebase.UpdateHint.

   + ShowHint is a bit more implemented.

Marc