Rename Slave to Host

The role of a slave as a host for Factorio servers is not well reflected
in its name and has caused confusion among users.  Rename slave to host
to better reflect its role as a host of Factorio servers.

packages/host/lua/export/control.lua

@@ -0,0 +1,11 @@
+local function send_json(channel, data)
+	data = game.table_to_json(data)
+	print("\f$ipc:" .. channel .. "?j" .. data)
+end
+
+script.on_init(function()
+	send_json("mod_list", game.active_mods)
+	for name, mod_setting in pairs(game.mod_setting_prototypes) do
+		send_json("mod_setting_mod", { name = name, mod = mod_setting.mod })
+	end
+end)