Fixes/improvements

• [MightyPirates#3621] Fix os.time() being off by one hour
• [MightyPirates#3682] Add error handling to the flash OpenOS program
• [MightyPirates#3764] Fix left and right names being swapped in the Rack GUI
• [MightyPirates#3774] Fix Jukebox driver (kebufu)
• [MightyPirates#3779] Fix os.sleep(0) causing too long without yielding (Ocawesome101)
• [#23] Make build pipeline properly use Java 8 again

List of contributors

asie, kebufu, Ocawesome101