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/project/Project.cpp

@@ -22,7 +22,7 @@
 
 #include "utility/file/FilePath.h"
 #include "utility/file/FileSystem.h"
-#include "utility/messaging/type/MessageClearErrorCount.h"
+#include "utility/messaging/type/error/MessageErrorCountClear.h"
 #include "utility/messaging/type/MessageFinishedParsing.h"
 #include "utility/messaging/type/MessageRefresh.h"
 #include "utility/messaging/type/MessageStatus.h"
@@ -342,7 +342,7 @@ void Project::buildIndex(const RefreshInfo& info, DialogView* dialogView)
 	}
 
 	MessageStatus(L"Preparing Indexing", false, true).dispatch();
-	MessageClearErrorCount().dispatch();
+	MessageErrorCountClear().dispatch();
 
 	dialogView->showUnknownProgressDialog(L"Preparing Indexing", L"Setting up Indexers");