gba_test v0.1.0

Added

• #[test] attribute for writing tests.
• Test runner() for running tests on the Game Boy Advance.
• TestCase trait for defining types that can be run on the test runner.
• Ignore enum to define whether a test should be ignored.
• ShouldPanic enum to define a test that is expected to panic.
• Runtime for handling running tests on the Game Boy Advance.