Task-number: QTCREATORBUG-364

Rename arguments to allArguments(), qmakeArguments() to userArguments()

Fix for that will come later

instead of a Project. Since BuildSteps "should" only care about the
BuildConfiguration not the Project. (Not 100% doable, but still.)

Note: I didn't fix all the connects and there are a few missing things.
This compiles, more work is coming.

The pointers can be used to distinguish BuildConfigurations

The project() should in most cases not matter, instead the
BuildConfiguration should. This shows all the information that needs to
move into the BuildConfiguration classes.

More API work.

Each project has it's own BuildConfiguarion * classes, they'll get a
decent type safe interface and the setValue/value stuff will be removed.

Might fix some sporadic crashes that can be seen on first creator run.

Move the API to the progress manager.
Added a first Mac implementation, other
platforms are pending.

Separate category and trCategory and introduce sorting characters
to the categories. Same for id/name.

Introduce new QString id() const-API and sort wizards by
[untranslated] category and id. Introduce respective constants.
Rubber-stamped-by: con <qtc-committer@nokia.com>

- Introduce project directory and "use" flag to file manager, use that
  in new item dialog
- Add configuration under Project settings, rename it to "General"
- Make wizards create project names as "untitled1.."
- Remove modules page from Qt application wizards (parametrizable)
- Give Utils::ProjectIntroPage a "Set as default location" toggle.
- Introduce wizard dialog base classes for handling that.
- Introduce notion of "last visited directory to file manager" for
  open and non-project wizards, route open through file manager.
- Clean out QmlAppWizard

Task-number: QTCREATORBUG-333
Rubber-stamped-by: con <qtc-committer@nokia.com>

 * Rename it to IPropertiesPanel in accordance with new naming standards.
 * Do not derive from Context. That is not needed.
 * Add an icon() method.
 * Fix all usages of this interface.

Reviewed-By: dt