FR: Mission Event Editor Search Bar

[PremiumColt]

A search bar that directs you to where an event is located in the mission event list would be nice. While using notepad can be used to "find" an event, it doesn't help if that event is in the middle of literally hundreds of others. Bonus points if double-clicking an event in the is-event-true/falce operator also takes you to the event in question, much like how double-clicking a message in the message box takes you to which events feature them.

[MjnMixael]

After getting #6961 done, this seems quite doable.