Replace piecemeal designation of upstreams with the concept of moons, which is simpler and easier to use and inherits all the cool live update stuff of worlds (now called planets) and global roots.

node/Node.hpp

@@ -105,7 +105,6 @@ public:
 	int addLocalInterfaceAddress(const struct sockaddr_storage *addr);
 	void clearLocalInterfaceAddresses();
 	int sendUserMessage(uint64_t dest,uint64_t typeId,const void *data,unsigned int len);
-	void setRole(uint64_t ztAddress,ZT_PeerRole role);
 	void setNetconfMaster(void *networkControllerInstance);
 	ZT_ResultCode circuitTestBegin(ZT_CircuitTest *test,void (*reportCallback)(ZT_Node *,ZT_CircuitTest *,const ZT_CircuitTestReport *));
 	void circuitTestEnd(ZT_CircuitTest *test);