Moved game-specific spells into data/spells.ts. Added types. Added Spell.MultiSpell. Changed Spellbook to class.
Moved game-specific spells into data/spells.ts. Added types. Added Spell.MultiSpell. Changed Spellbook to class.

tpoikela/battles,tpoikela/battles,tpoikela/battles,tpoikela/battles,tpoikela/battles