Add sendResult to AceComm callback forwarding

Most people probably interface with AceComm rather than CTL directly, so
it makes sense to pass the send result from CTL fully through the chain.

One downside is that because AceComm currently appends its own textLen
argument, we're forced to effectively sandwich it by appending
sendResult to the end of the list.

AceComm-3.0/AceComm-3.0.lua

@@ -20,7 +20,7 @@ TODO: Time out old data rotting around from dead senders? Not a HUGE deal since
 local CallbackHandler = LibStub("CallbackHandler-1.0")
 local CTL = assert(ChatThrottleLib, "AceComm-3.0 requires ChatThrottleLib")
 
-local MAJOR, MINOR = "AceComm-3.0", 12
+local MAJOR, MINOR = "AceComm-3.0", 13
 local AceComm,oldminor = LibStub:NewLibrary(MAJOR, MINOR)
 
 if not AceComm then return end
@@ -97,8 +97,8 @@ function AceComm:SendCommMessage(prefix, text, distribution, target, prio, callb
 
 	local ctlCallback = nil
 	if callbackFn then
-		ctlCallback = function(sent)
-			return callbackFn(callbackArg, sent, textlen)
+		ctlCallback = function(sent, sendResult)
+			return callbackFn(callbackArg, sent, textlen, sendResult)
 		end
 	end