Mace to Stormbreaker

Texture Pack Update:

1. Enhanced model: The model is now more defined; I got rid of the texture overlay, and now the handle is closer to the original.

1. Added a model for the Heavy Core: In fact, it now uses the model of the Storm Breaker head.

1. Changed Names: For the English game language, I changed the original names "Mace" and "Heavy Core" to "Storm Breaker" and "Storm Breaker Head".