Energy Distrubution Grid: Power Flow

[Indy2222]

Based on #472 and #473, implement a simple (v1) algorithm of energy distribution (power flow).

• Power may flow from any source (any battery) to any target.
  • Even from a unit to a power plan if needed.
• No energy interlink (an edge in the grid graph) can transmit than X watts (a constant in the code).
• Power may not flow from batteries with 0 charge or to batteries with maximum charge.
• The flow is "optimal" in some sense.
  • This must be designed so that "the optimal":
    • makes sense in the context of the game
    • can be computed with a non-super-complex algorithm
    • can be computed efficiently
  • For example: flow to batteries/units close to full discharge should be prioritized

Note that the goal of the issue is a version 1 implementation / algorithm. Simplicity is of higher priority than perfection.

See https://en.wikipedia.org/wiki/Maximum_flow_problem for inspiration.

[github-actions]

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