fetch color format, storage buffer alignment and stores/atomics support
at init
support for framebuffers used as input attachments
use Allocator instead of VulkanAllocator
return handles instead of unique handles
store texture in the cache map instead of the heap
make related functions member of the class (CollectCleanup, killtex ->
Clear)
refactor common OSD stuff into rend/osd
vulkan support for OSD
align uniform buffers according to physical device requirements
destroy old swap chain before creating new one
some drivers don't support some 16-bit texture formats for optimal
tiling
Transition images back to transfer and update them instead of
deleting/recreating.
Keep track of in-flight texture command buffers and free them when idle.
Flyinghead