[9731] Cleanup in skil steps code.

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m src/game/Level2.cpp

m src/game/Level3.cpp

m src/game/Player.cpp

m src/game/Player.h

m src/game/SkillHandler.cpp

m src/game/SpellEffects.cpp

m src/shared/revision_nr.h



[9731] Cleanup in skil steps code.



* Move step arg in SetSkill to end for make possible for it default value.

* Merge GetSkillStep function to SetSkill, base at fact that old GetSkillStep

  code can be != 0 only for already known spell, so at update

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