Function "invasion"

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Arguments for scripting mode:

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

Supported flags:

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

Test result

OS	Invasion on Mini-client 800x520	Invasion 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	Not yet supported
MacOS 10.14 High Sierra	Not work	Not work