QtIFW

Fix the default installation location for all examples

Now they are all located in distinct subfolders of
one common IfwExamples folder located in home.

Change-Id: Ife92e8d7f7fc33bc1f941f49c75333d0e4fc72d1
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@theqtcompany.com>