logic: Moved all error handling logic into ErrorController (issue #577)

* Handle all error related messages in ErrorController
* Moved error filter state from Storage to ErrorController
* Moved all error related messages to type/error subdirectory
* Enable all errors shown by default
* Always show unfiltered error count in status bar and overview
* Fixed all errors shown again when changing error filter on errors for file

src/lib/component/controller/GraphController.cpp

@@ -64,6 +64,11 @@ void GraphController::handleMessage(MessageActivateAll* message)
 	buildGraph(message, false, true, message->acceptedNodeTypes != NodeTypeSet::all());
 }
 
+void GraphController::handleMessage(MessageActivateErrors* message)
+{
+	clear();
+}
+
 void GraphController::handleMessage(MessageActivateTokens* message)
 {
 	TRACE("graph activate");
@@ -496,11 +501,6 @@ void GraphController::handleMessage(MessageGraphNodeMove* message)
 	}
 }
 
-void GraphController::handleMessage(MessageShowErrors* message)
-{
-	clear();
-}
-
 void GraphController::handleMessage(MessageShowReference* message)
 {
 	if (!message->tokenId || !message->fromUser)