d3d11: Fix d3d11 object leak and fix initial resolution

d3d11window: Initialize surface rect with given external window handle

Unlike internal window, resize event might not happen with external window.

d3d11device: Report alive d3d11 objects at the end

It would be useful for debugging d3d11 object leak.

d3d11: Fix ID3D11SamplerState leak

Fixes: #1135 (closed)