Bot messages customization

[Gyoo]

People have requested to be able to customize the different messages that the bot is showing during events.

The idea that came out of my mind after a discussion with @angelde98 was to have an external XML file (or whatever other format, he suggested Java style properties) from which the program will read the different messages. The users can write into this file to change the messages.

[Gyoo]

Finally I chose to make a second tab to the settings panel, where all the messages are gathered.
The panel might need a touch of redesign because I still don't know how to do that perfectly but at least it works.

Next step is to add tags, for instance {user} or whatever. Right now, only the messages that don't designate someone are customizable.