Allow multi-word chatcommand channels.

• Allows multi-word chatcommand channels, separated by a '.'.
    · Example: '@/test.test2' will run '/test test2'.

README.md

@@ -14,7 +14,8 @@ Chat channels are created automatically when adding the first user and deleted
 The following channel prefixes exist:
 
  - `@`: A PM. This will PM the user after the `@`.
- - `@/`: A chatcommand. This will run the chatcommand after the `@`.
+ - `@/`: A chatcommand. This will run the chatcommand after the `@`. Any
+   instances of `.` in this command will be replaced with ` `.
  - `#`: A channel. This is just a group PM prefixed with the channel name. If
    a user in the channel uses chat_channels and has you in a channel with the
    same name, the message will display as a chat message in the channel.

init.lua

@@ -118,7 +118,7 @@ chat_channels.send_message = function(msg, c)
         minetest.send_chat_message('[off] ' .. msg)
         return true, 'Message sent!'
     elseif c:sub(1, 2) == '@/' then
-        minetest.run_server_chatcommand(c:sub(3), msg)
+        minetest.run_server_chatcommand(c:sub(3):gsub('%.', ' '), msg)
         if c == '@/s' then
             minetest.display_chat_message('-' .. main_channel .. '- <' ..
                 localplayer .. '> (s) ' .. msg)