Added rendering support for groups. Each group member has now a box around it with the group's name and its own randomed color.
Added auto-group joining upon first-time joining.
Fixed some messages.
Fixed several silent bugs.
Reduced amount of messages spam by categorizing them in different parts of the screen depending on the kind of message.
Added replication for groups, so that clients can now render such data.
Added configurable classes for Messages and other classes to allow more advanced per-map-modding.