Replace spaces with tabs for Lua, and more (#399)

Convert code indents to tabs to be consistent with the rest of the
JavaScript code.  This commits covers all of the lua code, some of the
hand written JSON code and the lone HTML and CSS files that were not
using tabs.

packages/slave/lua/export/control.lua

@@ -1,8 +1,8 @@
 local function send_json(channel, data)
-    data = game.table_to_json(data)
-    print("\f$ipc:" .. channel .. "?j" .. data)
+	data = game.table_to_json(data)
+	print("\f$ipc:" .. channel .. "?j" .. data)
 end
 
 script.on_init(function()
-    send_json("mod_list", game.active_mods)
+	send_json("mod_list", game.active_mods)
 end)