Make autorun platform-specific

[markshust]

I'd like to track page views with autorun, but only on specific platforms. For example, I don't want to send page tracking to Intercom, but I'd like to send it to Google Analytics.

We can keep the main autorun option for those that want to continue sending page tracking events to all services, but I think it would be great to make a platform-specific autorun option, that overrides the default autorun option for that platform.

[karldanninger]

Hey @markoshust, sounds like a cool improvement! I'll mark this as an enhancement, and would love to accept a pull request for this.