[Feature][BattleSystem] SkillCasting

[Kiritsu]

Skill Casting (feature)

The SkillCasting contains the following tasks:

• Handle errors
• Add skills:
  • create a command to add a skill (by its id: SkillVnum)
• TryCast a skill:
  • handle effects
  • handle ranges
  • handle cooldowns
  • handle mana costs
• Launch a skill via client bases' packets

Estimated time: ~3 hours

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Additional information:

• If TryCast passes, launch the effect and initialize a cooldown.
• Usage of DateTime object for the Cooldown