data: saving errors to Storage

* saving errors in separate sqlite table
* use MessageShowErrors to show the errors in the UI
* show error count permanently in the right side of the status bar with click to show
* fixed clicking of error locations
* fixed expanding of files with errors

src/lib/component/controller/SearchController.h

@@ -6,6 +6,7 @@
 #include "utility/messaging/type/MessageActivateTokens.h"
 #include "utility/messaging/type/MessageFind.h"
 #include "utility/messaging/type/MessageSearchAutocomplete.h"
+#include "utility/messaging/type/MessageShowErrors.h"
 
 class StorageAccess;
 class SearchView;
@@ -15,6 +16,7 @@ class SearchController
 	, public MessageListener<MessageActivateTokens>
 	, public MessageListener<MessageFind>
 	, public MessageListener<MessageSearchAutocomplete>
+	, public MessageListener<MessageShowErrors>
 {
 public:
 	SearchController(StorageAccess* storageAccess);
@@ -24,6 +26,7 @@ private:
 	virtual void handleMessage(MessageActivateTokens* message);
 	virtual void handleMessage(MessageFind* message);
 	virtual void handleMessage(MessageSearchAutocomplete* message);
+	virtual void handleMessage(MessageShowErrors* message);
 
 	SearchView* getView();