code optimization

- lifecycle functions for widgets
- persistence functions

Signed-off-by: Peter Siegmund <developer@mars3142.org>

components/insa/src/common/Widget.cpp

@@ -4,6 +4,22 @@ Widget::Widget(u8g2_t *u8g2) : u8g2(u8g2)
 {
 }
 
+void Widget::enter()
+{
+}
+
+void Widget::pause()
+{
+}
+
+void Widget::resume()
+{
+}
+
+void Widget::exit()
+{
+}
+
 void Widget::update(uint64_t dt)
 {
 }