Demul v0.7 180428

多機種街機模擬器 Demul 更新版本，內容如下 :

* fixed image distortion on Nvidia GPUs
* rebuilt using latest Visual Studio

http://forum.emu-russia.net/viewtopic.php?f=25&t=503&sid=8a551a568762f8f3bf9c6f1c49eaf637&start=180