[Abendlied]

Refers to Pyrokinesis Issue: #1052

Added spell Pyrokinesis handling for Gothic I

• Added caster (Player) and target (NPC, monster, Orc) effects for Gothic I Pyrokinesis while casting the spell
• Trigger damage infliction on the target and stop when casting ends, mana is depleted or casting is interrupted
• Persistent effects across animation changes
• Remove persistent effects when the affected target dies
• Restrict to Gothic I, not interfering with other spells and Gothic II spells

Verification:
Tested Pyrokinesis against NPCs, monsters and Orcs.
Verified damage against targets with different magic protection values.
Checked for regression on other AOE spells such as Gothic I Fire Rain, Ice Wave as well as Gothic II Fire Rain.

Known gap: Pyrokinesis now does not kill, it only strikes NPC down, also after multiple attempts. XP is granted after each strike down, infinitely. I aim to fix this in a separate PR.

Note: Possible additional cleanup case: Npc::closeWeapon() resets spell-casting state without calling stopSpellTargetEffect(). This can potentially and by chance happen when entering water (falling from an edge, tripping while casting?) and closing the spell wielding weapon state. I could not reproduce this in a normal gameplay but it might be possible by chance. I have therefore left this out of the PR. @Try Let me know if you think it should also be handled in closeWeapon().