Add some infrastructure for unit tests#108

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dyc3 wants to merge 2 commits intoHearthSim:masterfrom

dyc3:unit-tests

Commits on Jan 5, 2022

add unity project used to build test fixtures
dyc3
committed

Commits on Jan 6, 2022

add a unit test for extracting a single text asset, mostly as an example
dyc3
committed