Try to integrate AMD's VulkanMemoryAllocator

VMA solves some memory management details for us by providing a general purpose resource allocator on top of Vulkan functions.

The issue names no files, tests, or entry points; start by locating the renderer's Vulkan resource and memory-management code and reviewing AMD's VulkanMemoryAllocator documentation. Done means the renderer uses VMA for the relevant Vulkan allocations without breaking existing rendering behavior, but the issue does not define a narrower acceptance test.

Written by the indexing model from the issue text.