C# automatic binding

[notdanilo]

This PR depends on sensorial-systems/ligen#79

There are two possible strategies to use the automatic binding mechanism:

1. Keeping the src/bindings source files to use ligen on them.
2. Remove the src/bindings files and use ligen on openlimits-exchange traits and model types. Possibly adding openlimits-binance, for instance, to export a function to create the Binance client.