Zwei Schaedel 2nd Skill

[OrkunKocyigit]

Scope of Change:

This PR aims to implement Zwei Schaedel second skill provides %20 echo to 3rd hit.

Requirements:

• Bonus dmg effect does not stack with multiple weapons.
• Bonus dmg effect only applies to 3rd hit of triple attack.
• Bonus dmg effect only applies to dark allies.

Changes included in this PR

• Weapon parser python script now parses Zwei Schaedel 2nd skill.
• 2nd skill removed from armData-ssr.txt for 3* weapons.
• Zwei Schaedel weapon now has "Bonus Damage on 3rd Attack" (3回目の攻撃に闇属性追撃効果 (20%)) skill.
• zwei-echo sub skill has been added.
• New skill type echoThirdHit added to cover bonus damage on 3rd attack.
• zwei-echo adds 0.20 to echoThirdHit effect added to skill calculations.
• echoThirdHit effect has been added to additional damage with given value amount / 3.

Changes NOT included in this PR

• Any other weapon

Use Cases

• Dark char %100 TA will have 20 / 3 = 6.7% bonus echo at average.

• Non dark char will have 0% echo regardless.

• Dark char with 10% TA should have 20 * 0.10 / 3 = 0.67% bonus echo at average.

• Any char with 0% TA should have 0% bonus echo.

[Groovman]

LGTM

[kei-gbf]

note related tasks (noted on #233 as uncompleted task)

Need to account for Bonus DMG in supplemental damage as it applies to it separately. (Add an echo count field for Djeeta and each character?)

• supplemental damage for additional(bonus) damage implementation was not completed
  • multiple bonus damages should get multiple supplemental damages,
    but only single supplemental damage for multiple bonus damage.

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追撃枠が未考慮の為、与ダメ上昇の計算に影響有
複数の追撃に対して与ダメ上昇が一つしか乗りません。
(#233 与ダメ上昇実装時からの課題）