Opportunity hauling: Look for closest valid stockpile to position instead of best

[LecrisUT]

Implementation:

• copy Rimworld.StoreUtility.TryFindBestBetterStoreCellFor() and Rimworld.StoreUtility.TryFindBestBetterStoreCellForWorker
• replace check (int)priority < (int)foundPriority with distance < foundDistance in TryFindBestBetterStoreCellFor
• Replace TryFindBestBetterStoreCellForWorker to look for minimum of carrier.PositionHeld and destination
• Optional: on the haulpath, every 2*cutoff radius cells add to the search radius in the replacement of TryFindBestBetterStoreCellForWorker.

TestBench:

• Quickload colony
• Make a low priority stockpile near job destination
• Make a higher priority stockpile far away (beyond your cutoff radius)
• Check for opportunity

Potential problems:

• Search can become expensive when a lot of stockpiles are created.

(Copied from the discord. I'll give it a try as well once I've finished writing my AutoPatcher and ToolsFramework mods)

[LecrisUT]

Integrated ony my own. Would be interesting to implement a central framework instead.