Removes `Refresh_RenderTarget`, `Refresh_CreateRenderTarget` and `Refresh_QueueDestroyRenderTarget`. Render targets are now managed by the implementation.
Adds `REFRESH_TEXTUREFORMAT_B8G8R8A8`.
Adds `Refresh_AcquireSwapchainTexture`. Returns a swapchain texture for the requested window.
Removes `Refresh_QueuePresent`. It is now assumed that the texture returned by `Refresh_AcquireSwapchainTexture` will be presented. This texture can be manipulated like any other texture.
Adds `Refresh_GetSwapchainFormat`. Returns the swapchain format for the requested window.
Reviewed-on: MoonsideGames/Refresh#15
Co-authored-by: cosmonaut <evan@moonside.games>
Co-committed-by: cosmonaut <evan@moonside.games>