mdem showing fixes && buffer indicator

src/include/main.h

@@ -4,7 +4,7 @@
 
 #include "parser.h"
 
-void update();
+void update(bool isChanged = false);
 void saveMdem();
 
 struct MdemBuffer {
@@ -12,3 +12,5 @@ struct MdemBuffer {
 	time_t                   trainedAt = 0;
 };
 
+void updateMdemInfo(std::string filename = "", bool isChanged = true);
+

src/include/trainWindow.h

@@ -19,3 +19,5 @@ void initiatePractice(
 	MdemBuffer        *mdemBuffer,
 	PracticeAlgorithm  algorithm
 );
+
+void hideQuestionElements();