Reviewed-by: Thorbjorn

Since we use addAutoReleasedObject we would rather unclean call the
class destructor.

 * Ease cross device development by introducing 'targets' which
   group build- and runsettings that are valid for this one target

 Most of the kudos for the code review go to dt. Con, thorbjorn,
 ckandler and others did also review parts of this patch.

Reviewed-by: dt

Reviewed-by: ck

Most attributes have moved into the settings page.

Includes Maemo tool chain, run configuration, run control,
manager, etc.

Adds the DebuggerManager to the object pool. This is ugly, but
nobody came up with anything better on short notice. To be
refactored.

Co-Authored-By: kh1