[9731] Cleanup in skil steps code.

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<pre>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</pre>



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