Change the CmakeList

Now it compiles on windows
The SFML libs are now statically linked
Removed lib in the common lib
Update the README
Set all builds option to OFF by default
Add pfa pdf
Add the enet lib and begin the server
Merge branch 'develop' of github.com:izissise/PFA into develop

Conflicts:
	client/src/main.cpp
Make compiles flags accessible in cmakelist.txt
Add cvar doc in doxygen
Merge branch 'develop' of github.com:izissise/PFA into develop
Move lib includes
Remove hardcore warnings
correct some warnign and errors on enet exemple
Merge branch 'develop' into menu
removed warnings