Add a spells dictionary

[mafranks]

Spells have been added manually so it would be difficult to change them at this point. Add a spells dictionary and refactor the code to pull from the dictionary as needed. It should include the spell name, casting cost, base purchase price (may be more expensive by a multiplier in some places) and heal/damage range.

[mafranks]

Completed addition in bd97467d1b8bb2be3d9e2ec9c8a320535683fb3b Should be easy to add new spells or change spell attributes now.