logic: rewrote messages handling token activation for correct restoring on undo

* saving search query to undo stack with MessageSearch
* saving node and edge with name to undo stack with MessageActivateNode and MessageActivateEdge
* added FeatureController that handels distribution of MessageActivateTokens
* clearing views when refreshing or changing project
* clearing undo stack when changing project
* added StorageCache derived from StorageAccessProxy

src/lib/data/search/SearchMatch.cpp

@@ -129,7 +129,11 @@ std::deque<std::string> SearchMatch::searchMatchDequeToStringDeque(const std::de
 		stringDeque.push_back(match.encodeForQuery());
 	}
 	return stringDeque;
+}
 
+std::string SearchMatch::searchMatchDequeToString(const std::deque<SearchMatch>& searchMatchDeque)
+{
+	return utility::join(searchMatchDequeToStringDeque(searchMatchDeque), "");
 }
 
 std::string SearchMatch::getNodeTypeAsString() const