Spell Disk 0.9.0c Update

Added mana cost information to the compendium for spell items.
Optimized the fire snake's projectile in both game modes.
Made the Grail upgrade rewards have a chance to be different item types.
Increased the frequency of Curved Sword artifact triggering with dash spells. Added a frame buffer between each creation.
Added a frame buffer for Poison Arrow artifact.
Fixed a rare issue where War Hammer artifact could not be activated.