Ensure boo IObj instances are heap-allocated

include/boo/BooObject.hpp

@@ -10,8 +10,9 @@ namespace boo
 class IObj
 {
     std::atomic_int m_refCount = {0};
-public:
+protected:
     virtual ~IObj() = default;
+public:
     virtual std::unique_lock<std::recursive_mutex> destructorLock() { return {}; }
     void increment() { m_refCount++; }
     void decrement()

lib/graphicsdev/Metal.mm

@@ -1231,6 +1231,8 @@ struct MetalCommandQueue : IGraphicsCommandQueue
         if (!m_running)
             return;
 
+        @autoreleasepool
+        {
             /* Update dynamic data here */
             MetalDataFactoryImpl* gfxF = static_cast<MetalDataFactoryImpl*>(m_parent->getDataFactory());
             std::unique_lock<std::recursive_mutex> datalk(gfxF->m_dataMutex);
@@ -1257,8 +1259,6 @@ struct MetalCommandQueue : IGraphicsCommandQueue
             }
             datalk.unlock();
 
-        @autoreleasepool
-        {
             [m_enc endEncoding];
             m_enc = nullptr;