Fix leave open option for cmd plugin
Fix leave open option for cmd plugin

Add "Wait for a key press before closing" option.
See #141 for more info.

qianlifeng/Wox,Wox-launcher/Wox,qianlifeng/Wox,lances101/Wox,qianlifeng/Wox,lances101/Wox,Wox-launcher/Wox