[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/GameLogic/SCA_RandomEventManager.cpp

@@ -45,8 +45,8 @@ using namespace std;
 #endif
 
 SCA_RandomEventManager::SCA_RandomEventManager(class SCA_LogicManager* logicmgr)
-		: m_logicmgr(logicmgr),
-		SCA_EventManager(RANDOM_EVENTMGR)
+		: SCA_EventManager(RANDOM_EVENTMGR),
+		m_logicmgr(logicmgr)
 {
 }