ENH: improved memory management system and fixed crashes

Examples/Sandbox/main.cpp

.../VulkanRenderer/PostProcessing/imstkVulkanPostProcess.cpp

...ng/VulkanRenderer/PostProcessing/imstkVulkanPostProcess.h

...derer/RenderDelegate/imstkVulkanCapsuleRenderDelegate.cpp

...enderer/RenderDelegate/imstkVulkanCapsuleRenderDelegate.h

...Renderer/RenderDelegate/imstkVulkanCubeRenderDelegate.cpp

...anRenderer/RenderDelegate/imstkVulkanCubeRenderDelegate.h

...enderer/RenderDelegate/imstkVulkanDecalRenderDelegate.cpp

...nRenderer/RenderDelegate/imstkVulkanDecalRenderDelegate.h

...enderer/RenderDelegate/imstkVulkanPlaneRenderDelegate.cpp

...nRenderer/RenderDelegate/imstkVulkanPlaneRenderDelegate.h

...lkanRenderer/RenderDelegate/imstkVulkanRenderDelegate.cpp

...VulkanRenderer/RenderDelegate/imstkVulkanRenderDelegate.h

...nderer/RenderDelegate/imstkVulkanSphereRenderDelegate.cpp

...Renderer/RenderDelegate/imstkVulkanSphereRenderDelegate.h

...r/RenderDelegate/imstkVulkanSurfaceMeshRenderDelegate.cpp

...rer/RenderDelegate/imstkVulkanSurfaceMeshRenderDelegate.h

Source/Rendering/VulkanRenderer/imstkVulkanBuffer.h

Source/Rendering/VulkanRenderer/imstkVulkanFramebuffer.cpp

Source/Rendering/VulkanRenderer/imstkVulkanFramebuffer.h