Improve ore and mine placement

[ashleynewson]

Ore (pretty much the entire economy) is one of the primary aspects of a map. The current system only places expansions randomly and doesn't reliably populate expansions with ore.

• The amount of ore in a map should probably not be entirely random, but populated to meet a target cash value (perhaps auto scaled with players or map size).
• Ore should be placed more reliably around expansions.
• Ore patches should ideally be more interesting shapes than circles.
• Ore/mine patch placement should perhaps be less random, but placed to encourage interesting play. Perhaps this means placing equidistantly from players?

Research is needed from high-quality map packs.

[ashleynewson]

Based on some initial research from various human-made maps:

• Aim for roughly $50,000 starting resources on a map per player.
• Roughly 8 mines per player.
• Multi-mine expansions should be more common.

Some maps have fairly neat blobs of ore, others are scattered, with a few holes.

[ashleynewson]

An option for placing in equidistant areas is still a possibility. This could also apply to tech structures.