fix: security vulnerabilities

Tested that all functions related to the touched files work

will test sqlite on a CI build

dPhysics/dpWorld.cpp

@@ -87,7 +87,7 @@ void dpWorld::Shutdown() {
 }
 
 bool dpWorld::IsLoaded() {
-	return m_NavMesh->IsNavmeshLoaded();
+	return m_NavMesh && m_NavMesh->IsNavmeshLoaded();
 }
 
 void dpWorld::StepWorld(float deltaTime) {