data: bookmark refactoring

* implemented handling of aggregations in bookmarks
* split index Storage and bookmark storage
* each sqlite database has its own version now
* added bookmark tests
* fixed creating bookmark tables when project can be loaded but bookmark db does not exist
* fixed font size for bookmarkview tooltips
* using bookmark cache now
* using default category name when none specified by the user
* raising bookmark windows when they should be shown
* clearing a bookmark or category in the editor will now update the star icon accordingly
* non-persistent bookmarks use ids of nodes and edges now (instead of names)
* git ignore .srctrlbm files

src/lib/data/SqliteDatabaseIndex.cpp

@@ -0,0 +1,25 @@
+#include "data/SqliteDatabaseIndex.h"
+
+SqliteDatabaseIndex::SqliteDatabaseIndex(const std::string& indexName, const std::string& indexTarget)
+	: m_indexName(indexName)
+	, m_indexTarget(indexTarget)
+{
+}
+
+SqliteDatabaseIndex::~SqliteDatabaseIndex()
+{
+}
+
+void SqliteDatabaseIndex::createOnDatabase(CppSQLite3DB& database)
+{
+	database.execDML((
+		"CREATE INDEX IF NOT EXISTS " + m_indexName + " ON " + m_indexTarget + ";"
+	).c_str());
+}
+
+void SqliteDatabaseIndex::removeFromDatabase(CppSQLite3DB& database)
+{
+	database.execDML((
+		"DROP INDEX IF EXISTS main." + m_indexName + ";"
+	).c_str());
+}