Vulkan 1.1

[GabrielMajeri]

I've opened this issue to track Voodoo's support for Vulkan 1.1

While the new minor version did not add any new functions, it simply made some extensions core (they needn't be enabled), and removed their KHR suffix.

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Since Voodoo relies on vks for its C bindings, until that's updated, we'll probably not support Vk 1.1. Note that there was some work done towards Vk 1.1 in the next branch of the vks repository, but there haven't been any changes since 2 months ago.