Epic: Richer planning model

[ApocDev]

Deepen what the planner models beyond rates and recipes: alternate goal units, preferred defaults, spoilage, power and pollution, and fungible fluid fuel. These are solver and modeling changes, distinct from the logistics-throughput display work tracked in its own epic.

Sub-issues:

• Planner: support rate windows and low-throughput stock goals #10 — rate windows and low-throughput stock goals.
• Preferred defaults ("Favorites") for machines, modules & solid fuel #18 — preferred defaults (favorites) for machines, modules, and solid fuel.
• Planner: spoil-buffer sizing (chest space to hold an item until it rots) #19 — spoil-buffer sizing.
• Planner: incidental-spoil risk flag (+ optional planned spoil rate) #20 — incidental-spoil risk flag.
• Power & pollution budget per block, rolled up #23 — power and pollution budget per block.
• Generic fluid-fuel energy commodity (energy:fluid) for fungible fuel demand #25 — generic fluid-fuel energy commodity.
• Planner: per-product rate goals (multiple pinned outputs per block) #36 — per-product rate goals (multiple pinned outputs per block).
• Planner: keep-in-stock goals & capital (building) material requirements #38 — keep-in-stock goals & capital (building) material requirements.
• Planner: adaptive number precision + large-number abbreviation for rates/quantities #74 — adaptive number precision & large-number abbreviation.