Core/Utils: Migrate further to Utils::Id

The coreplugin/id.h header is kept for downstream for now.

Change-Id: I8c44590f7b988b3770ecdc177c40783e12353e66
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/emacskeys/emacskeysplugin.cpp

@@ -48,6 +48,7 @@ extern void qt_set_sequence_auto_mnemonic(bool enable);
 QT_END_NAMESPACE
 
 using namespace Core;
+using namespace Utils;
 
 namespace {
 QString plainSelectedText(const QTextCursor &cursor)

src/plugins/emacskeys/emacskeysplugin.h

@@ -26,7 +26,7 @@
 
 #include <extensionsystem/iplugin.h>
 
-#include <coreplugin/id.h>
+#include <utils/id.h>
 
 #include <QTextCursor>
 
@@ -88,7 +88,7 @@ private:
     void scrollHalfDown();        // C-v
     void scrollHalfUp();          // M-v
 
-    QAction *registerAction(Core::Id id, void (EmacsKeysPlugin::*callback)(),
+    QAction *registerAction(Utils::Id id, void (EmacsKeysPlugin::*callback)(),
                             const QString &title);
     void genericGoto(QTextCursor::MoveOperation op, bool abortAssist = true);
     void genericVScroll(int direction);