zink: add renderdoc handling
renderdoc won't work with zink most of the time because it's random which api is chosen to capture, so ZINK_RENDERDOC should be used to specify start:end frames to ensure that the vulkan command stream is captured
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renderdoc won't work with zink most of the time because it's random which api is chosen to capture, so ZINK_RENDERDOC should be used to specify start:end frames to ensure that the vulkan command stream is captured