Any DEFINE used in qmljsdebugger-lib.pri is also passed to the users
code.

Incorporate into qmljsdebugger-lib.pri

Task-number: QTCREATORBUG-2951

- Renaming the screen orientation enum and keys
- Explicit constructors
- Virtual destructors
- Renamed some occurences of 'Qml' in comments to 'QML'
- Adding descriptive comments to all generated files which should
  not be touched by the user.
- Adding missing license headers to the qmljsdebugger sources

Task-Number: QTCREATORBUG-2885
Reviewed-by: Friedemann Kleint
Reviewed-by: dt

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.

Make sure that the private API used from Qt is compiled with
Q_DECL_IMPORT.

Task-number: QTCREATORBUG-2609

Copy over the private header files to creator source tree, along the
lines of the what the designer plugin does.

Reviewed-by: Christiaan Janssen

Moved qmljsdebugger to a dir under qml/, made qmlobserver compile
without creator dependencies and made it compile with debugging
helpers.

Reviewed-by: hjk