add 2 more spells to the spellbook

[igroglaz]

It's known that there is a possiblity to add two new spells to mage's spellbook. Lest do it!

Minimum task:
1st slot Light
2nd slot Curse

Maximum task (harder to implement):
1st slot Light
2nd slot Heal spell, but with different maxRange... As atm we got Heal spell with maxRange=0, so mage could heal only himself; new spell could have 6 (but much less healing potency)

[igroglaz]

duplicates #71