Custom commands

#7 @Eelviny I worked on your feature request. In course of that I added a module that allows you to define custom chat commands in a config file. You can also modify the list of commands ingame or in the server console. Just type '/customcommands' to see the list of commands that are available.
To use the chat commands you type '!<my command>'. You can even attach chat commands to each other. Then they will then be processed successive.