* \uicontrol fixes
* More acurately describe what a custom wizard can do now
* Do not mention class wizards anymore: They got merged into
  file wizards
* Remove table summarizing JSON and XML wizards and just recommend
  using JSON wizards instead.
* Fix documentation on wizard locations
* Add section with tips for wizard development

Change-Id: I1485aad1a11394035313ca83063572503af73f97
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@theqtcompany.com>