Support --fw(--force-windowed) on Vulkan

[locke-lunarg]

--fw is only supported on d3d, not Vulkan. It could change window size and resolution. If Vulkan want to support it, except modify window size, It also needs to modify CreateSwapchainKHR, CmdBeginRenderPass, CmdSetViewport, CreateFramebuffer and attachments of framebuffer, like depth/stencil images. It's more complicated than d3d case.

If Vulkan support it someday, maybe we could consider to combine --fw and --fwo(--force-windowed-origin) that could change window position.