Refactored compute shader imaging example, use dedicated graphics queue if available (Closes #218)
Refactored compute shader imaging example, use dedicated graphics queue if available (Closes #218)

ming4883/Vulkan,grim210/Vulkan,dreadwords/Vulkan,SaschaWillems/Vulkan,SaschaWillems/Vulkan,SaschaWillems/Vulkan,jpbruyere/Vulkan,jpbruyere/Vulkan,SaschaWillems/Vulkan,ming4883/Vulkan,ming4883/Vulkan,grim210/Vulkan,SaschaWillems/Vulkan