Unify the original qml file generated by Qt Quick UI / Qt Quick
Application wizards. Use a default size of 360x360.
Furthermore, add a MouseArea such that clicking on the app will close
it (demonstrating the use of Qt.quit()).
Reviewed-by: Alessandro Portale
The wizards already provide a default suffix for file creation.
But since the user is still free to specify something else it's better to leave it to Creator to decide which one is the proper editor.
After all, this reflects how the file will be treated by Creator (including the next time it's opened).
Task-number: QTCREATORBUG-2006
Remove all hacks/conventions of considering the last generated
file as project file, etc. and instead add attributes flags to
Core::GeneratedFile, giving fine-grained control of what to do
with the file. Implement static utility functions in wizards
that handle it. Add boolean XML-attributes "openeditor"/"openproject"
to the file elements used by the CustomWizard XML-specification.
Manually set the attributes in all wizards.
Task-number: QTCREATORBUG-1166
