This was broken in case of no targets page being used, and using
the project name variable in default values for wizard parameters in the
page following the intro page (like it is done in the hello world
wizard).

Reviewed-by: Friedemann Kleint

Pass around shared context containing basic replacement map.
CustomProjectWizard adds %ProjectName% to it obtained from signal
BaseProjectWizardDialog::introPageLeft(). Move replacement code into
context. Add new modifier 'c' for capitalizing words.

...to not suggest invalid file paths.

  * Use id() for methods returning a string used to represent
    some type of object.
  * Use displayName() for strings that are meant to be user
    visible.
  * Quieten some warnings while touching the files anyway.
  * Move Factories to their products in the plugins where that
    was not done before.

Reviewed-by: dt

- 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>