Give TextEditorActionHandler an explicit parent and unify usage.

The action handler implicitly passed ownership to ICore, which is non-
to the action handler. We now consistently create the action handler in
the editor factory, give ownership to the editor factory, and don't hold
a reference to it.

Change-Id: I4372f8de966e3ceff87c06c5528c6b54522c1d57
Reviewed-by: David Schulz <david.schulz@digia.com>

src/plugins/qmljseditor/qmljseditorplugin.h

@@ -42,10 +42,6 @@ namespace Utils {
 class JsonSchemaManager;
 }
 
-namespace TextEditor {
-class TextEditorActionHandler;
-} // namespace TextEditor
-
 namespace Core {
 class Command;
 class ActionContainer;
@@ -115,7 +111,6 @@ private:
 
     QmlJS::ModelManagerInterface *m_modelManager;
     QmlJSEditorFactory *m_editor;
-    TextEditor::TextEditorActionHandler *m_actionHandler;
     QmlJSQuickFixAssistProvider *m_quickFixAssistProvider;
     QmlTaskManager *m_qmlTaskManager;