Function "change character"

Arguments for scripting mode:

accept first argument as character slot (1 or 2 or 3)

eg: change-character 3

Supported flags:

• --exit=X means bot will exit after X secs if not completed, no matter how many loop remaining
• --shutdown shutdown your computer after bot exit
• Global flags

Notes:

• Automatically exit if used to select character that is already selected after a period of time

Author: @daredoes

Since v3.5.1 at #91