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.

include/ZeroTierOne.h

@@ -848,8 +848,8 @@ enum ZT_VirtualNetworkConfigOperation
 enum ZT_PeerRole
 {
 	ZT_PEER_ROLE_LEAF = 0,     // ordinary node
-	ZT_PEER_ROLE_UPSTREAM = 1, // upstream node
-	ZT_PEER_ROLE_ROOT = 2      // global root
+	ZT_PEER_ROLE_UPSTREAM = 1, // moon root
+	ZT_PEER_ROLE_ROOT = 2      // planetary root
 };
 
 /**
@@ -1903,17 +1903,6 @@ void ZT_Node_clearLocalInterfaceAddresses(ZT_Node *node);
  */
 int ZT_Node_sendUserMessage(ZT_Node *node,uint64_t dest,uint64_t typeId,const void *data,unsigned int len);
 
-/**
- * Set peer role
- *
- * Right now this can only be used to set a peer to either LEAF or
- * UPSTREAM, since roots are fixed and defined by the World.
- *
- * @param ztAddress ZeroTier address (least significant 40 bits)
- * @param role New peer role (LEAF or UPSTREAM)
- */
-void ZT_Node_setRole(ZT_Node *node,uint64_t ztAddress,enum ZT_PeerRole role);
-
 /**
  * Set a network configuration master instance for this node
  *