This introduces basic Path Tiler map editor tool functionality to TS
with some segmented MultiBrush definitions. The included MultiBrush
definitions cover both the Temperate and Snow tilesets's Beach, Cliff,
and WaterCliff tiles.
MultiBrush now incorporates Height and Ramp information. Some
associated Terraformer utilities are updated with the API surface
change.
There are some known limitations that are not addressed in this PR:
- The path laying UI doesn't account for the map's current heights.
- The preview does not use a correct height or Z-ordering.
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