Some common feedback about preview generated maps is that they are too
chokey. This change aims to add a new terrain type called "Plots" that
retains the variety of terrain features present in the Gardens
terrain, but opens up the play area a bit more. In essence, it strikes
a balance between the densely packed Gardens terrain type and the
loosely packed Plains and Parks terrain types.
This new terrain type notably uses a smaller noise feature size to
provide smaller but more regular map structure, and expands the
pathway cutouts and contour spacings for forests and cliffs.
The new Plots terrain type is made available for both RA and CNC and
becomes the new default.
This is an additive configuration-only change. Replay and multiplayer
map generation retains forward/backward compatibility.
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