gui : small fix on 4 players screen menu

(added player 3 nick that was missing)
gui : added lan multiplayer gui screens & buttons
Merge remote-tracking branch 'origin/gui'

Conflicts:
	src/fr/miage/atlantis/gui/Gui.java
	src/fr/miage/atlantis/gui/controllers/GuiController.java
Merge remote-tracking branch 'remotes/origin/master' into savegame

Conflicts:
	src/fr/miage/atlantis/gui/controllers/GuiController.java