Rename QtStateMachine => QtQml.StateMachine

Change-Id: I21a57ff048673942f67dca4bfbd18fa7ddafc99b
Reviewed-on: https://codereview.kdab.com/12689
Reviewed-by: Continuous Integration <build@kdab.com>
Reviewed-by: Volker Krause <volker@kdab.com>
Pimpl QmlExporter

Change-Id: Icc265928921214e04f384b24364d329e248ae270