More Equipment

Modified the armor value of the equipment

Added silver tool

Added the recipe of silver equipment and silver equipment.Silver equipment is better than iron equipment.

1. Added sliver nugget
2. Added the craft table between silver block, silver ingot, sliver nugget

1. Fixed the vulnerability that silver ingots cannot synthesize silver blocks
2. Modified the generation of silver ore veins

1. Added silver ore, silver block and silver ingot
2. Silver ore will be randomly generated at the position of Y coordinate 0-64