[GameEngine] Commit all Kester's changes made to the gameengine to restore 2.25 like physics.

[SCons] Build with Solid as default when enabling the gameengine in the build process
[SCons] Build solid and qhull from the extern directory and link statically against them

That was about it.

There are a few things that needs double checking:

* Makefiles
* Projectfiles
* All the other systems than Linux and Windows on which the build (with scons) has been successfully tested.

source/gameengine/Rasterizer/RAS_IRenderTools.h

@@ -64,8 +64,8 @@ public:
 	
 	RAS_IRenderTools(
 	) :
-		m_modified(true),
-		m_clientobject(NULL)	
+		m_clientobject(NULL),
+		m_modified(true)
 	{
 	};