- It adds an optional feature to support dynamic linkage of Vulkan instead of using default linkage.
- It is now possible to have several potentially working implementation and whenever the Vulkan library was available it can work.
This allows for binding the pipeline/sending draw commands
(via `ImGui_ImplVulkan_RenderDrawData`) against any subpass, rather than
being restricted to only the first subpass.
Without this, attempting to bind the pipeline against a subpass other than
the first one results in validation layer errors and, at worst, some drivers
failing if the subpass attachments differ.
Hossein Noroozpour
Brandon DeRosier
ocornut