Rework Guide Menu.

Added support for weapons stats.

Which means you can diy your own turrets , baby effect, cyber ball and even fruit trees of QMtato !

1. No longer need content-loader as dependency.

2. All resources used by Brolab are converted to lazy-load, it means Brolab will have more compatibility.

1. Now delete or add custom items / characters no longer to restart the game

1. Added LOAD button in Items Manager to load diy item

1. Added a preview when creating custom item