Function "gvg"

This function does not support select badge cost, so choose it before turn this on

Arguments for scripting mode:

accept first argument as loop count is how many times to do GVG before exit

Supported flags:

• --exit=X means will exit after X secs if not completed, no matter how many loop remaining. Usage: ./gvg.sh 10 --exit=1200 means will stop doing GVG after farmed 10 times or after 1200 seconds (20m), depends which condition completed first
• --shutdown shutdown your computer after bot exit
• Global flags

Test result

OS	GVG on Mini-client 800x520	GVG on Steam 800x480
Ubuntu 18.04 (development environment)	Work perfectly	N/A
Windows 10 x64	Not tested	Not yet supported
Windows 7 x64 (on Virtual Box)	Not tested	Work perfectly
MacOS 10.14 High Sierra	Not work	Not work