implement remaining logic

Signed-off-by: Folling <mail@folling.io>

src/objects/properties/property_source.cpp

@@ -3,10 +3,22 @@
 #include <boost/functional/overloaded_function.hpp>
 
 #include <objects/blueprint.hpp>
+#include <objects/entity.hpp>
+#include <cppbase/templates.hpp>
 
 IkarusPropertySource::IkarusPropertySource(Data data):
     data{data} {}
 
+IkarusId IkarusPropertySource::get_id() const {
+    return boost::variant2::visit(
+        cppbase::overloaded {
+            [](IkarusBlueprint const * blueprint) { return blueprint->id; },
+            [](IkarusEntity const * entity) { return entity->id; }
+        },
+        data
+    );
+}
+
 IkarusPropertySource * ikarus_property_source_create_blueprint(IkarusBlueprint * blueprint) {
     return new IkarusPropertySource{blueprint};
 }