Additional Melee Cantrips

As part of building the Magus class, I had to come up with melee cantrips that represent the other elements - my Magus is highly elemental, but built around the elements of acid, fire, cold, and lightning.

I don't see any reason that those should be confined to the Magus class though, so I'm also publishing them here. They're added to the spell lists of the Magus, Warlock, Wizard, and Sorcerer classes.

Blackfrost Blade

Acid Slash

Shocking Strike