Allow for custom title trimming

[krafit]

For various (SEO) reasons, meetups pre- or postfix their event titles with either the meetup's name, "WP Meetup Dortmund", or with the meetup's name and a counter "104. WP Meetup Stuttgart –".

While it might theoretically be possible to regex our way out of that, it would be way easier to allow meetups to set a custom number of characters to be stripped from the beginning or end of their event titles before they are used as post titles.

[MatzeKitt]

This would be problematic whenever this amount changes, e.g. from “1. WP Meetup […]” to “10. WP Meetup […]” to “100. WP Meetup […]” and so on …

[krafit]

agreed, but these changes are not terribly frequent