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One fix is in the runner, which is part of the completion
engine itself. The other is specific for C++.

Task-number: QTCREATORBUG-5947
Change-Id: Ib8fff1eb5adad1ffb2a11da66c50b545e1457df8
Reviewed-on: http://codereview.qt.nokia.com/4355

Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Fawzi Mohamed <fawzi.mohamed@nokia.com>
(cherry picked from commit e15443e9)

This is a re-work of our completion engine. Primary goals are:

- Allow the computation to run in a separate thread so the GUI is not locked.
- Support a model-based approach. QStrings are still needed (filtering, etc), but
internal structures are free to use more efficient representations.
- Unifiy all kinds of *assist* into a more reusable and extensible framework.
- Remove unnecessary dependencies on the text editor so we have more generic
and easily "plugable" components (still things to be resolved).

Change-Id: I8b73d583be1ee7183f4074bce49d5390e38631a2

Reviewed-by: hjk

The new QML Inspector depends on DebuggerPlugin. Also added a dropdown menu into
the debugger toolbar from which the user can select the used debugging
language, e.g. C++ or QML.