Editors: Move id() from editor to document.

Change-Id: Ib81076842ab1c16832224790194b001206404d64
Reviewed-by: hjk <hjk121@nokiamail.com>
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

src/plugins/qbsprojectmanager/qbsprojectfile.cpp

@@ -38,6 +38,7 @@ namespace Internal {
 QbsProjectFile::QbsProjectFile(QbsProject *parent, QString fileName) : Core::IDocument(parent),
     m_project(parent)
 {
+    setId("Qbs.ProjectFile");
     setFilePath(fileName);
 }