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/StorageCache.cpp

@@ -0,0 +1,22 @@
+#include "data/StorageCache.h"
+
+void StorageCache::clear()
+{
+	m_queryToTokenIds.clear();
+}
+
+std::vector<Id> StorageCache::getTokenIdsForQuery(std::string query) const
+{
+	std::map<std::string, std::vector<Id>>::const_iterator it = m_queryToTokenIds.find(query);
+
+	if (it != m_queryToTokenIds.end())
+	{
+		return it->second;
+	}
+
+	std::vector<Id> ids = StorageAccessProxy::getTokenIdsForQuery(query);
+
+	m_queryToTokenIds.emplace(query, ids);
+
+	return ids;
+}