Simplification of the PataNext.Game folder

[guerro323]

Is there a real need for creating PataNext.Game as a seperate project?
All of its code could be implemented into PataNext.Simulation.Mixed project (with some into *.Client)

If such change is done, PataNext.Simulation.Mixed could be just renamed to PataNext.Mixed or PataNext.Game.

Some files or utilities could be also be exported to GameHost (such as StorageWatcher or some networked related components)