D3D: Eliminate black borders, add 4:3 and 16:9 settings, and the widescreen hack. Unfortunately this temporarily breaks MSAA (in d3d only) until I have time to fix it.

• 修正了烦人的黑边问题，增加了4：3和16：9宽屏设定。同时MSAA多重取样抗锯齿的选项暂时性被破坏，需要时间修复。窗口放大缩小似乎也有出错问题，跳帧不起作用。