Enchantments

Note: It's my first time doing something with C++
There are several problems with this:
- `a_Digger` needn't be a `cPlayer`, we could have plugins that implement villagers mining blocks. You should check first if the entity is a player, using `cEntity::IsPlayer()`
- Don't put names in the source, they don't add any valuable information, they just pollute the code. There's the CONTRIBUTORS file for acknowledgements, no need for other mentions.