Core/Unit: cleanup and minor fixes of miss and resist calculations

- Removed Unit::GetUnitMeleeSkill as it was basically a copy of GetMaxSkillValueForLevel
- Removed static from GetEffectiveResistChance, as this was passed anyways, changed name to CalculateAverageResistReduction, which better reflects what it does
- Fix melee miss chances calculated from attacker maxskill instead of victim maxskill
- Do actual checks if spell can be resisted/missed in MagicSpellHitResult (ie chances > 0)
- Fixed SPELLMOD_RESIST_MISS_CHANCE calculation in MeleeSpellMissChance
- Minor codestyle and cleanup of diminishing returns calcs

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