[apps/escher/poincare] Use 2D Edition in Sequence and Graph apps.

EditableExpressionView is renamed ScrollableViewWithCursor.
EditableExpressionView is now a View that displays either a TextField or
a ScrollableViewWithCursor, depending on Poincare::Preferences.

Change-Id: Id44ddcd9a83f5fd17d65753ca4c94c5c7cda9b8a

escher/src/modal_view_controller.cpp

@@ -95,6 +95,11 @@ bool ModalViewController::ContentView::isDisplayingModal() const {
   return m_isDisplayingModal;
 }
 
+void ModalViewController::ContentView::reload() {
+  markRectAsDirty(frame());
+  layoutSubviews();
+}
+
 ModalViewController::ModalViewController(Responder * parentResponder, ViewController * child) :
   ViewController(parentResponder),
   m_contentView(),
@@ -162,3 +167,7 @@ void ModalViewController::viewDidDisappear() {
   }
   m_regularViewController->viewDidDisappear();
 }
+
+void ModalViewController::reloadView() {
+  m_contentView.reload();
+}