Make console look better

Hello :)
I have modified the console by taking inspiration from that of Craftbukkit.
If you are wondering why I have removed the prefix / from commands on the console, it's to prevent some "fail" to be showed on the chat, so, if we want write a message, we can use the command say
And I have added the prefix "Console :" when we are using the command say to differenciate admin messages from automatics messages. The others commits is to make the console more beautiful :)
I hope you will like it !