[Sea of Claws] New Vehicle properties

[Forien]

Vehicles in Sea of Claws should have new System Properties.

• Manoeuvre — shortened "Man", this is represented as a Success Levels Modifier, for example –2 SL, +1 SL etc. Can probably be normal integer
• Crew — object:
  • Starting — integer representing amount of Crew that vessel started voyage with
  • Current — integer representing amount of Crew still around
• Size — string, required for handling Melee Attacks against ships (SoC, page 116). Can be derived from Length (SoC, Standard Boat Characteristics table, page 96).
  • Required for combat implementation ( #1965 )
• Morale — integer value. Initial of 75.
  • Vehicle should also be subject to Effect that depends on the current Morale Value (SoC, page 125).
  • Morale should only be in effect if Vehicle has Crew
  • Related #1962

[domfarolino]

Just a note for posterity, this seems quite related to https://github.com/whatwg/html/issues/10232, which exercises the same early-return condition.