Grid drawing on FieldPanel debugged.
Implemented ship drawing.
Fixed visual glitch, appering when window is resized.

When window was resized the visual glitch appeared, due to the
fact that resizing window only caused grid to be repainted, but
not the ships. Now that is not true and everything is being
repainted on the resize.
Docs section reorganized.
Reorganized Message and created FieldPanel for RoundScreen.
Skeleton for network exchange created.
Fixed bug preventing from game start.

Game would not start because socket wrappers were not being
created.
Now player can't shoot at cells that have been shot.