Chat → Grids Relation

File in server/game/Chat	Includes file in server/game/Grids
Channels / Channel.cpp	Notifiers / GridNotifiers.h
Channels / Channel.cpp	Notifiers / GridNotifiersImpl.h
Channels / ChannelAppenders.h	Notifiers / GridNotifiers.h
Chat.cpp	Cells / CellImpl.h
Chat.cpp	Notifiers / GridNotifiersImpl.h