Fix: Skills don't do damage after leveling it up

[RyanYappert]

Alert all party members with an NTC when a player or pawn ranks up a custom skill.

Addresses issue #359.

New to C# so the pallet search is probably wonky.

Checklist:

• [ ] The project compiles
• [ ] The PR targets develop branch

[RyanYappert]

Including some additional changes in the same neighborhood.

• New packets for S2C_SKILL_NORMAL_SKILL_LEARN_NTC and S2C_SKILL_PAWN_NORMAL_SKILL_LEARN_NTC.
• Integrating them into the JobManager flow when learning Normal/Core skills.

Currently notifies only party members, but the above conversation about notifying the whole server likely echoes to this point as well.

[alborrajo]

Merge/Rebase on top of develop and then we can merge it