add 'on_physics_update' entity event

src/logic/scripting/scripting.hpp

@@ -130,6 +130,7 @@ namespace scripting {
     void on_entity_fall(const Entity& entity);
     void on_entity_save(const Entity& entity);
     void on_entities_update(int tps, int parts, int part);
+    void on_entities_physics_update(int tps, int parts, int part);
     void on_entities_render(float delta);
     void on_sensor_enter(const Entity& entity, size_t index, entityid_t oid);
     void on_sensor_exit(const Entity& entity, size_t index, entityid_t oid);

src/logic/scripting/scripting_entities.cpp

@@ -279,6 +279,16 @@ void scripting::on_entities_update(int tps, int parts, int part) {
     lua::pop(L);
 }
 
+void scripting::on_entities_physics_update(int tps, int parts, int part) {
+    auto L = lua::get_main_state();
+    lua::get_from(L, STDCOMP, "physics_update", true);
+    lua::pushinteger(L, tps);
+    lua::pushinteger(L, parts);
+    lua::pushinteger(L, part);
+    lua::call_nothrow(L, 3, 0);
+    lua::pop(L);
+}
+
 void scripting::on_entities_render(float delta) {
     auto L = lua::get_main_state();
     lua::get_from(L, STDCOMP, "render", true);