Moving the qli API to the qubic-http service.

[AndyQus]

https://github.com/qubic/qubic-http

[AndyQus]

commit v4.11: api models/interfaces of the various APIs created, new folder structure

I have now created the interfaces for the switch to the other APIs and have stored them in a new folder structure so that it is still compatible with the current status. @sally
This way I can gradually address and implement the new endpoints. I have created all the endpoints from the APIs

[AndyQus]

commit v.4.11: new function getLatestStats() in api.stats.service
commit v4.11: new function getRichList() in api.stats.service