Update to new testing framework

[tommymcm]

To better organize the testing framework, I have added cmemoir/test.hpp, which allows you to register tests and expected outputs.

int main() {
  TEST(my_test) {
    int x = 0;
    expect(x == 0, "x not equal to 0");
  }
}

Low priority, but all existing tests should be ported to this structure.

[tommymcm]

This is completed and all tests have been updated as of 5174179