Don't confuse users by two defines they have to comment in when
they just want to 'debug': Instead QMLJSDEBUGGER now activates
both the Js Debugger & and the QmlObserver services. Finetuning
can still be done by using the (undocumented) NO_JSDEBUGGER,
NO_QMLOBSERVER defines.
Moved qmljsdebugger to a dir under qml/, made qmlobserver compile
without creator dependencies and made it compile with debugging
helpers.
Reviewed-by: hjk