Add: allows to get LuaObject metatable statically.

[akeit0]

No description provided.

[akeit0]

local v = Vector2(1, 2)

state.Environment["Vector2"] = new (LuaVector2.TypeMeta);

[LuaObject]
public partial class LuaVector2
{
    class TypeMetatableClass : ILuaUserData
    {
        LuaTable? ILuaUserData.Metatable
        {
            get => LuaVector2.Metatable;
            set => throw new NotSupportedException();
        }
    }

    public static ILuaUserData TypeMeta
    {
        get
        {
            typeTable ??= new TypeMetatableClass();
            return typeTable;
        }
    }

    static TypeMetatableClass? typeMeta;
    float x;
    float y;

    [LuaMember("x")]
    public float X
    {
        get => x;
        set => x = value;
    }

    [LuaMember("y")]
    public float Y
    {
        get => y;
        set => y = value;
    }

    [LuaMetamethod(LuaObjectMetamethod.Call)]
    public static LuaVector2 Create(LuaValue _, float x, float y)
    {
        return new LuaVector2() { x = x, y = y };
    }

    [LuaMetamethod(LuaObjectMetamethod.Add)]
    public static LuaVector2 Add(LuaVector2 a, LuaVector2 b)
    {
        return new LuaVector2() { x = a.x + b.x, y = a.y + b.y };
    }

    [LuaMetamethod(LuaObjectMetamethod.ToString)]
    public override string ToString()
    {
        return $"x:{X} y:{Y}";
    }
}