Make method naming more consistent.

* 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

src/plugins/coreplugin/imode.h

@@ -47,10 +47,10 @@ public:
     IMode(QObject *parent = 0) : IContext(parent) {}
     virtual ~IMode() {}
 
-    virtual QString name() const = 0;
+    virtual QString displayName() const = 0;
     virtual QIcon icon() const = 0;
     virtual int priority() const = 0;
-    virtual const char *uniqueModeName() const = 0;
+    virtual QString id() const = 0;
 };
 
 } // namespace Core