fix: security vulnerabilities

Tested that all functions related to the touched files work

will test sqlite on a CI build

dGame/Entity.h

@@ -112,6 +112,7 @@ public:
 
 	uint16_t GetNetworkId() const;
 
+	// Cannot return nullptr.
 	Entity* GetOwner() const;
 
 	const NiPoint3& GetDefaultPosition() const;