Add unitTest for OSC API
This MR adds unit tests for the Satie OSC API. All OSC messages defined in SATIE-OSC-API.md
are included (see !197 (merged) for an exception). The tests work as follows:
- boot SATIE and create a basic scene
- send an OSC message to SATIE
- validate that the message had the desired effect
- quit SATIE, start over for next test
This unit test will ensure that the OSC API's basic functionality works as documented. As we move forward, we can add additional tests to this class that verify special edge cases.