Change-Id: I8b73d583be1ee7183f4074bce49d5390e38631a2

Task-number: QTCREATORBUG-3752

Reviewed-by: hjk

Reviewed-by: Leena Miettinen

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

... based on the git clone wizard. Provide a wizard for browsing
gitorious hosts.

Task-number:  44831

Move GitClient::filterUntrackedFilesOfProject into submit editor.
Make checkout wizards use page lists for greater flexibility.

Task-number: 244831