add standard components test

src/logic/scripting/lua/lua_engine.cpp

@@ -49,8 +49,8 @@ static void create_libs(lua::State* L) {
     openlib(L, "world", worldlib);
 
     // components
-    openlib(L, "Rigidbody", rigidbodylib);
-    openlib(L, "Transform", transformlib);
+    openlib(L, "__rigidbody", rigidbodylib);
+    openlib(L, "__transform", transformlib);
 
     addfunc(L, "print", lua::wrap<l_print>);
 }

src/logic/scripting/scripting.cpp

@@ -230,24 +230,21 @@ bool scripting::on_item_break_block(Player* player, const ItemDef* item, int x,
 bool scripting::on_entity_spawn(const EntityDef& def, entityid_t eid) {
     std::string name = def.name + ".spawn";
     return lua::emit_event(lua::get_main_thread(), name, [eid] (auto L) {
-        lua::pushinteger(L, eid);
-        return 1;
+        return lua::pushinteger(L, eid);
     });
 }
 
 bool scripting::on_entity_despawn(const EntityDef& def, entityid_t eid) {
     std::string name = def.name + ".despawn";
     return lua::emit_event(lua::get_main_thread(), name, [eid] (auto L) {
-        lua::pushinteger(L, eid);
-        return 1;
+        return lua::pushinteger(L, eid);
     });
 }
 
 bool scripting::on_entity_grounded(const EntityDef& def, entityid_t eid) {
     std::string name = def.name + ".grounded";
     return lua::emit_event(lua::get_main_thread(), name, [eid] (auto L) {
-        lua::pushinteger(L, eid);
-        return 1;
+        return lua::pushinteger(L, eid);
     });
 }