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_gui/qt/element/QtCodeNavigator.cpp

@@ -7,8 +7,8 @@
 #include <QVBoxLayout>
 
 #include "utility/logging/logging.h"
+#include "utility/messaging/type/error/MessageShowError.h"
 #include "utility/messaging/type/MessageScrollCode.h"
-#include "utility/messaging/type/MessageShowErrors.h"
 #include "utility/ResourcePaths.h"
 
 #include "data/location/SourceLocation.h"
@@ -918,7 +918,7 @@ void QtCodeNavigator::handleMessage(MessageShowReference* message)
 
 				if (ref.locationType == LOCATION_ERROR)
 				{
-					MessageShowErrors(ref.tokenId).dispatch();
+					MessageShowError(ref.tokenId).dispatch();
 				}
 			}