Improve Present and Swapchain

[redorav]

To conform with D3D12 and potentially other APIs

• Move AcquireNextImage to Present. Present calls potentially block
• Fence waiting is currently very explicit. Can we hide the implementation detail by making the swapchain do that behavior?
• Creating a swapchain can take a previous swapchain. We can force destroy the incoming handle once we extract the HWND or other necessary information so that we don't have to keep it around. Vulkan can actually take advantage of the previous swapchain when recreating it