The beginning of a small command interpreter plug in

The beginning of a small command interpreter plug in

RadegastInstance: now has a LoadAssembly method
ChatConsole: calls the Instance.CommandsManager

In the chat console when you type //help you'll get
[18:18] Result of Help : (0)
[18:18]  help: Shows help info Usage: //help help
[18:18]  thread: Runs a command in a thread Usage: //thread <long running command>
[18:18]  loadplugin: Loads plugins from a path Usage: //loadplugin c:\myplugindir\plugin.dll
[18:18] Listed 3 commands.

git-svn-id: https://radegast.googlecode.com/svn/trunk@205 f7a694da-4d33-11de-9ad6-1127a62b9fcd