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/vcsbase/vcsbaseeditor.h

@@ -70,11 +70,12 @@ enum EditorContentType {
 };
 
 // Helper struct used to parametrize an editor with mime type, context
-// and kind. The extension is currently only a suggestion when running
+// and id. The extension is currently only a suggestion when running
 // VCS commands with redirection.
 struct VCSBASE_EXPORT VCSBaseEditorParameters {
     EditorContentType type;
-    const char *kind;
+    QString id;
+    QString displayName;
     const char *context;
     const char *mimeType;
     const char *extension;