Make username and realname configurable.

config.lua

@@ -32,6 +32,8 @@ setting("string", "server", nil, true) -- Server address to connect to
 setting("number", "port", 6667) -- Server port to connect to
 setting("string", "NSPass") -- NickServ password
 setting("string", "sasl.user", irc.config.nick) -- SASL username
+setting("string", "username", "Minetest") -- Username/ident
+setting("string", "realname", "Minetest") -- Real name/GECOS
 setting("string", "sasl.pass") -- SASL password
 setting("string", "channel", nil, true) -- Channel to join
 setting("string", "key") -- Key for the channel

init.lua

@@ -137,8 +137,8 @@ function irc.connect()
 	end
 	irc.conn = irc.lib.new({
 		nick = irc.config.nick,
-		username = "Minetest",
-		realname = "Minetest",
+		username = irc.config.username,
+		realname = irc.config.realname,
 	})
 	irc.doHook(irc.conn)