[all] Issue 4 fixed (Mixer menu)

[sky9x / Taranis] Issue 1 fixed (PlayFile/Play were called from an interrupt). To be tested and re-tested
[all] FrSky alarms are not any more sent from the 10ms interrupt, but from the main loop. To be tested as well

src/view_main.cpp

@@ -267,7 +267,7 @@ void displayTopBar()
     LCD_NOTIF_ICON(x, ICON_TRAINEE);
     x -= 12;
   }
-  else if (1) {
+  else if (0) {
     LCD_NOTIF_ICON(x, ICON_TRAINER);
     x -= 12;
   }