Utilize PF_State-based caching for uploads

[Wunkolo]

PF_GetCurrentState from PF_ParamUtilSuite3 can be utilized to get a pretty coherent "hash" of an input layer. With this, the uploaded contents of a "texture" derived from a PF_EffectWorld can be identified to have been uploaded already to the GPU and can be re-used.
A PF_State may be added to the current sequence-cache allowing cases such as a still-image input layer to only have to be uploaded to the GPU once and re-used much quicker.

Vulkanator/include/Vulkanator.hpp

Lines 91 to 116 in 9e38576

	struct SequenceCache
	{
	// If we are only using a smaller subset of the entire buffer
	// Then we should resize the entire buffer to be smaller if it is this
	// percentage smaller than the cached size
	// If an allocation comes in that is %15 smaller than the cache, then
	// the buffer to fit
	static constexpr glm::f32 ShrinkThreshold = 0.15f;
	// Cache for the staging buffer
	std::size_t StagingBufferSize = 0u;
	vk::UniqueBuffer StagingBuffer = {};
	vk::UniqueDeviceMemory StagingBufferMemory = {};
	// We use these structs so that we can easily "==" compare the image in
	// the cache with any new requests coming in
	vk::ImageCreateInfo InputImageInfoCache = {};
	vk::ImageCreateInfo OutputImageInfoCache = {};
	vk::UniqueImage InputImage = {};
	vk::UniqueDeviceMemory InputImageMemory = {};
	vk::UniqueImage OutputImage = {};
	vk::UniqueDeviceMemory OutputImageMemory = {};
	} Cache;

Additional testing may have to be done depending on the coherency of the PF_State such as changes in extents, quality, bit-depth, etc.