The map generators previously placed spawns in an order that was
somewhat arbitrary and unintuitive to users.
This change provides and makes use of a Terraformer utility to reorder
spawns, based on their location, so that they typically make more
sense to users selecting spawns from a lobby.
Added to ExperimentalMapGenerator (RA, CnC), and D2kMapGenerator.
Note that as this changes the output of the map generator for a given
selection of settings. (Replays using generated maps from older
versions will lose compatibility and no longer load.)
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