Add RESTSplitter function in C++ source of Peer

[Glitchfix]

The RESTSplitter() will be invoked in tracker mode to set the splitter address. It should connect to the crossroad server and send a GET request to obtain the splitter address and port and set them for the peer.

[Glitchfix]

Glitchfix@66f819a
got error in the console make.py after commit

[Glitchfix]

Glitchfix@0f451a9

Fixed the RESTSplitter function