Flyby - Add controls to add / remove activities

[nicolas_ow]

We often use flybys more like event replays than to find out whose path we crossed during an activity.

When there are tons of people, we cannot control who we would like to have on the replay.

For example, I would love to have both activities 11181038687 and 11178649508 in a flyby replay, but we were a little apart and there are so many random participants that the list of activities we get when trying is just irrelevant.
(e.g. https://labs.strava.com/flyby/viewer/#11181038687?c=u1qcvjj0&z=E&t=1c6vVe)

Suggestion 1 (preferred): Update the API / UI to allow querying flybys with more than 1 activity ID.
Suggestion 2: Suggest adding activities from athletes we follow (even if distance/spatial correlation is very low) before activities from unrelated athletes.

[Jane]

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