Remove unneeded widget (has been added unintendedly in 60fffd

If no 'qmlviewer' executable is found in the PATH, iterate through the
list of configured Qt versions and try to find a qmlviewer there. This
should help users configuring creator such to play with Qml.

Right now the first qmlviewer found in a Qt version is selected. A UI
to let the user select one explicitly was not possible any more (string
freeze).

This requires a dependency from QmlProjectManager to
Qt4ProjectManager.

Reviewed-by: dt

The heuristics to find the file to run and the logic that decides
whether the show / debug button is shown weren't in sync. Also, don't
try to run .qmlproject files if open in the editor.

Reviewed-by: Lasse Holmstedt

Latest qt renamed qml executable back to qmlviewer, and also named
the executable again QML Viewer instead of Runtime/Launcher.

By introducing the OutputFormatter, RunControls can influence the formatting
depening on the application started. A nice (and intended) side-effect is that
the QML runtime specific formatting will not interfere anymore with anything
else.

Renamed RunConfiguration::configurationWidget to
createConfigurationWidget.

Reviewed-by: dt

It's not yet possible to attach to an external app running a qml
debugging server, because the server is only started on startup if an
env variable is set. Changing this requires action from Brisbane, but
even the current solution works for C++ apps with QML in them.

Task-number: BAUHAUS-585
Reviewed-by: dt

See commit c3a54c470 in qt

Task-number: BAUHAUS-548
Reviewed-by: kkoehne

Task-number: QTCREATORBUG-1040

See c722282c.

Use a lowercase .qml file found in project tree if no current file is
selected. This way we don't have to disable run controls if there are
some files to execute.

Reviewed-by: kkoehne

Reviewed-by: dt

Task-number: BAUHAUS-396
Reviewed-by: dt

Reviewed-By: con

All files have been renamed from Qml to QDeclarative.
Registration of types is now done in an initializer method.

Reviewed-by: Kai Koehne

Putting every class in it's own files + avoid "using namespace"