Add the capability to read files from sylva-units source

Priya Goyalrequested to merge
rmValuesFile into main

This MR makes values layering simpler and more flexible. It introduces type: SylvaUnitsFile to read values directly from the sylva-units source. valuesFrom.name is optional for SylvaUnitsFile.

covers #52 (closed)

Edited by Priya Goyal

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