Refactored defragmentation. Added class VmaDefragmentationAlgorithm, extracted from VmaDefragmentator.
Refactored defragmentation. Added class VmaDefragmentationAlgorithm, extracted from VmaDefragmentator.

GPUOpen-LibrariesAndSDKs/VulkanMemoryAllocator,GPUOpen-LibrariesAndSDKs/VulkanMemoryAllocator,GPUOpen-LibrariesAndSDKs/VulkanMemoryAllocator