Feat/spat plugin setup
This commit spins off ambi3port branch, !34 (closed) state. I reorganized the code to use @zkonate1's ambi3 setup from withing plugin's code. So SATIE now supports spatPlugin.setup function that gets executed right after booting the server. We may need to add a similar setup for code that needs to be initialized before but this takes care of our immediate needs. If you approve this MR, !34 (closed) can be simply canceled.