Raspberry Pi support

[sstaub]

A Raspberry Pi support will helpful which is configurable through a web interface, like Companion Pi.

[digital-pet]

I see a couple requests for Linux support already - #15 and #6

QT is cross-platform, although it would probably require some work to retarget the rest of the project to linux, and a web interface would add a whole new level of complexity. Probably simpler to lose the GUI, daemonize it, and toss it in docker, especially since the configuration file (oscrouter.txt) is already human-readable.