v0.5

• support for dispatching invocations based on buffer / image dimensions
• #define support for GLSL
• srgb<->unorm support for image views
• PersistentDescriptorSet API change and improvements
• VUK_DEBUG_ALLOCATIONS for dumping Vulkan allocations
• improved support for referencing Names from arbitrary sub-RenderGraphs
• allocator/resource improvements
• add calls to flush pending changes in CommandBuffer and then retrieve the underlying VkCommandBuffer for raw access
• significant cutdown on debug overhead in CommandBuffer
• many bugfixes