Conform 'mostCommonReply` to standard schema

[synechist]

After discussion with the developer building the TypeScript version of XRouter, we have agreed on a standard schema for 'mostCommonReply`:

1. mostCommonReply is renamed to the consensus object.
2. Go-XRouter output shall be in JSON as per the following example:

{
    "consensus":{
        "majorityStrength": "57%",
        "mostCommonReplyCount": 4,
        "mostCommonReply": ["reply"],
        "divergentReplyCount": 3,
        "divergentReplies": [
            {"count": 2, "reply": ["reply"]},
            {"count": 1, "reply": ["reply"]}
        ]
    },
    "queryCount":"Failed to find enough peers supporting xrGetBlockCount for xr::BLOCK whose fees fall within the limits set in your config file. You requested responses from 12 nodes, but only got 7. Please try to connect to more peers before retrying the request."
}

Parameters

Parameter	Type	Description
consensus	object	XRouter's "consensus" response
majorityStrength	string	The proportion, as a percentage, of mostCommonReplyCount relative to the sum of mostCommonReplyCount and divergentReplyCount
mostCommonReply	array	The reply object in snodeReply most commonly returned by service nodes
divergentReplyCount	int	The number of replies nonidentical with mostCommonReply
divergentReplies	array	An arrayed list of replies that diverge from mostCommonReply
count	int	the number of service nodes that responded with the divergentReply in question
reply	array	the reply object in snodeReply returned by the service node(s) in question
queryCount	string	Message used to flag when the number of service nodes that XRouter could find to response to a query is low than the number specified in queryCount

Flow diagram (draft)