Experimental support for smart plugs

I have implemented support for TP Link HS100 smart plugs for the Windows version of Play-a-Synth Host, it is still experimental so I have not updated the installer found in the downloads yet. This means that the synthesizers can be much more available to play, staying powered off when no one is playing.

At the moment I have enabled the support on my own synths (DeepMind 12 and OB-6) so please free to try out the new feature, the web interface will have a small delay at the start to allow the synthesizer to power up properly. I will add more of my own synthesizers (at least Waldorf Pulse 2 and Korg Minilogue) with the smart plugs once everything seems to be running ok.