Test framework

[BnjmnZmmrmn]

issue TBA

contents

• same content as my commits Build example games #22
• restructured commits

reviewer notes

• can we rebase dev-test to 3968358, then merge this? it fixes icky commits (made by me lol)

testing
running 5 tests
test game::mock::example::tests::initialize_simple_utility_zero_sum ... ok test game::mock::example::tests::initialize_simple_utility_general_sum ... ok test game::mock::example::tests::initialize_general_utility_general_sum ... FAILED test game::mock::example::tests::initialize_general_utility_zero_sum ... FAILED test game::mock::example::tests::visualize_all_example_games ... FAILED

[BnjmnZmmrmn]

seems like rebasing a remote branch is tricky. just going to close pr since contents are identical... will instead refactor