Clearly distinguish between 0- & 1-based indexing #504
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#496 uses the index from HasIndex to directly index arrays. This is great for performance but requires 0-based indexing.
Provinces use 1-based indexing for their 'external id' (data-loading, UI & console).
To remedy this, provinces now use 0-based indices for HasIndex and clearly marked 1-based indices for pathfinding, console, game actions and such.