little fixes (#183)

* Update

* Add: [Get/Set]AngularDaming for standardization

* Fix: Name error

* Add: [Get/Set][AngularDamping/MomentOfInertia] in PhysicsComponent2D

* Forgot in last commit

* Add: param coordSys in [PhysicsComponent2D/RigidBody2D]::SetMassCenter

* Add: Some forgotten inline

* Fix little error

* Fix: Indentation before case

* Move and Change GetCenterOfGravity

* Rename m_world into m_physWorld

* Rename GetWorld int GetPhysWorld

* Update: PhysicsSystem2D became an interface of PhysWorld2D

* Update Collison/PhysicsComponent because GetWorld was renamed

* Update tests

* Update: Make the interface usable with Entity instead of PhysicsComponent

* Update: Make GetPhysWorld private

* Update PhysicsSystem2D.hpp

* Update: indent

* Remove: useless blank line

* update order(?)

* Update PhysicsSystem2D.hpp

* Add calls to GetPhysWorld to attempt a nullptr value

* update include

* little fix

* add some missing inline

src/Nazara/Network/Win32/SocketImpl.cpp

@@ -29,7 +29,7 @@ struct tcp_keepalive
 #define SIO_KEEPALIVE_VALS    _WSAIOW(IOC_VENDOR,4)
 #endif
 
-#include <Winsock2.h>
+#include <winsock2.h>
 
 #include <Nazara/Network/Debug.hpp>