Draft: Alternative grids

[Azgaar]

Description

Alternative grids, based on idea of #832.

Type of change

• Bug fix
• New feature
• Refactoring / style
• Documentation update / chore
• Other (please describe)

Versioning

• Version is updated
• Changed files hash is updated

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[Azgaar]

Generally it works, but there are a couple of issues with hex grid geography that prevent from releasing the change.

1. Hex geometry is not ideal
   Voronoi calculation algorithm does not provide ideas voronoi cells geometry for hex points, probably due to algo simplifications.

The better option would be to calculate hex grid directly and not Voronoi grid. But it will take time to implement and custom solution will probably be bugged.

2. Generation code relies on grid to be a rectangular grid of cellsX x cellsY cells.
   The issue is bypassed by adding additional cells to odd rows that make cellsX a stable value, but there are still unknown issues (possible related) on bigger cells count.

3. This is a low-priority ticket.
   Most users probably don't need it. Regular grid looks too artificial while the whole FMG idea was to generate more realistic maps. So the PR is in on-hold for now.