Shorten every instance of "CHANNEL" to "C" and whisper too

To save a little space in messages, it's getting very cramped

Modules/NetworkMessenger.lua

@@ -165,7 +165,7 @@ function shared.NetworkMessenger.Init()
 	--/run Heimdall_Data.Test()
 	Heimdall_Data.Test = function()
 		local testmsg = {
-			channel = "WHISPER",
+			channel = "W",
 			message = "Hi, mom!",
 			data = "Secundus"
 		}