Bugfix: HARMPACK hand duplication

[Zetaplx]

Removed NetEnt reference from ExtraHandsEquipmentSystem handID assignment. Modified specific.yml to use a unique hand id set for the harmpack hands.

About the PR

Fixed bug where removing harmpacks after save failed to remove hands.

Why / Balance

Bugfixes. Is this section really necessary?

Technical details

• Old harmpack implementation used NetEnt ids in the name assignment of hand slots. These IDs do not persist.
• Modified ExtraHandsEquipmentSystem to use static IDs instead of Network IDs.
• Modified relevant YAML to use better naming for hands.

Requirements

• I have read and am following the Pull Request and Changelog Guidelines.
• I have added media to this PR or it does not require an in-game showcase.

Breaking changes

• Anyone currently weaking a HARMPACK in game will still keep their duplicate hands.
• Anyone with extra hands will keep their extra hands.

Changelog

🆑

• fix: HARMPACKs no longer create duplicate hands when removed after loading a save