Move tutorials to widgets.

All of these are very QWidget centric.
They cannot properly refer to the
sources without being part of the widget module.

This fixes around 300 qdoc errors.

Change-Id: I5a7c2dbc10f7913f7b088d6a0ac81323b3c287ac
Reviewed-by: Casper van Donderen <casper.vandonderen@nokia.com>

examples/examples.pro

@@ -14,7 +14,6 @@ SUBDIRS       = \
                linguist \
                sql \
                tools \
-               tutorials \
                touch \
                gestures
 }