Replace osc-ruby with fast_osc

[dermusikman]

I believe fast_osc was written specifically for Sonic Pi, and is now the OSC library in Sonic Pi. It's significantly faster than ruby-osc, and is a drop-in replacement.

[Widdershin]

Thanks for the pull request. fast_osc looks much faster!

My only concern is that it's a native extension, and building native extensions requires a compiler toolchain with the correct dev packages installed. I ran into an error attempting to compile it on my system (which I'm sure I could overcome with a few package installs).

I'm concerned this might make installation more difficult for beginners, and also I'm not sure about portability on Windows.

Do you know if there's a way we can fallback on a pure ruby osc library if the native extension compilation fails?

[dermusikman]

That's a good point... while I think a script may be able to do some meta-magic, I don't know that the gemspec would allow it.

I would think that if Sonic Pi is working, fast_osc should be available on the system, but I don't know how Ruby works in a Windows environment. (Admittedly, sometimes Ruby gets unnecessarily complicated in a Linux environment!)

I'll try to look into some of these points and let you know.

[davidair]

I could test on Windows if you'd like