Bug fixing

+ DB access is now right and uses copied sessions
+ DB session is now specifying the safe state and the mode
+ Fixed the issue with too early ICCC messages regarding to late cache
+ Add the MIME type for Dart
+ Fixed the issuse with wrong order of shutdown handlers
- TODO: Testing of these changes

Shutdown/Shutdown.go

@@ -9,7 +9,7 @@ type ShutdownHandler interface {
 }
 
 func AddShutdownHandler(handler ShutdownHandler) {
-	shutdownHandlers.PushBack(handler)
+	shutdownHandlers.PushFront(handler)
 }
 
 func executeShutdown() {