Sans Attack

-Added a new boss W.D. Gaster (Summon him with the mask item and hit the mystery man to start the fight) with new attacks, effects and weapons

-Added the mask, which adds multiple positive effect, but disables moving.

-Added ketchup and hotdogs, ketchup is made in the brewing stand like this 

-tweaked Sans' dodge, he will now randomly choose directions, and try to teleport if you get too close.