added web server support for human sl

[jopdorp]

This adds a flask wrapper flask_wrapper_human_sl_server.py around the humanslnet_server.py It's useful for integration with front ends, to allow them to do web requests to the humanslnet_server.py humanslnet_server.py gives a higher degree of control over the settings of the simulation, which can be preferable over the courser settings found in katago analysis

This is a working front end for it that I've implemented in ionic, cross platform React.js I'm aiming to compile this to android and ios. Android has support for pytorch using chaquo , so hopefully that will be doable. https://github.com/chaquo/chaquopy/issues/477