Remove included Lua and LuaSocket source

Also rename README.txt to README.md and update it.

config.lua

@@ -0,0 +1,59 @@
+-- This file is licensed under the terms of the BSD 2-clause license.
+-- See LICENSE.txt for details.
+
+
+mt_irc.config = {}
+
+local function setting(stype, name, default)
+	local value
+	if stype == "bool" then
+		value = minetest.setting_getbool("irc."..name)
+	elseif stype == "string" then
+		value = minetest.setting_get("irc."..name)
+	elseif stype == "number" then
+		value = tonumber(minetest.setting_get("irc."..name))
+	end
+	if value == nil then
+		value = default
+	end
+	mt_irc.config[name] = value
+end
+
+-------------------------
+-- BASIC USER SETTINGS --
+-------------------------
+
+setting("string", "nick") -- Nickname (default "MT-<hash>", <hash> 6 random hexidecimal characters)
+setting("string", "server", "irc.freenode.net") -- Server to connect on joinplayer
+setting("number", "port", 6667) -- Port to connect on joinplayer
+setting("string", "NSPass") -- NickServ password
+setting("string", "SASLUser", mt_irc.config.nick) -- SASL username
+setting("string", "SASLPass") -- SASL password
+setting("string", "channel", "##mt-irc-mod") -- Channel to join
+setting("string", "key") -- Key for the channel
+setting("bool",   "send_join_part", true) -- Whether to send player join and part messages to the channel
+
+-----------------------
+-- ADVANCED SETTINGS --
+-----------------------
+
+setting("string", "password") -- Server password
+setting("bool",   "secure", false) -- Enable a TLS connection, requires LuaSEC
+setting("number", "timeout", 60) -- Underlying socket timeout in seconds.
+setting("string", "command_prefix") -- Prefix to use for bot commands
+setting("bool",   "debug", false) -- Enable debug output
+setting("bool",   "enable_player_part", true) -- Whether to enable players joining and parting the channel
+setting("bool",   "auto_join", true) -- Whether to automatically show players in the channel when they join
+setting("bool",   "auto_connect", true) -- Whether to automatically connect to the server on mod load
+
+-- Generate a random nickname if one isn't specified.
+if not mt_irc.config.nick then
+	local pr = PseudoRandom(os.time())
+	-- Workaround for bad distribution in minetest PRNG implementation.
+	mt_irc.config.nick = ("MT-%02X%02X%02X"):format(
+		pr:next(0, 255),
+		pr:next(0, 255),
+		pr:next(0, 255)
+	)
+end
+