Reworked spells affecting challenge score and added Frenzy test

Fix #493

Fixed Frenzy spell to cause a player to lose 66% more points in case of a lost challenge and added a test for this spell.
Also did a minor rework on IDs of spells affecting challenge score (Charge/Weakness/Frenzy) and made it that bonus percents from different spells would cumulate in case that one player has two or more spells applied at a time.