Show lemniscate for queued goals

[theospears]

Goals in beeminder can be in a queued state. This means while the client has the latest server data, the server has processing to do to update the state of the goal. Previously this state was not surfaced in the app. Here we update the app to show an animated bee over the graph when in this state. This matches the website behavior.

Some refactoring is done to aid with this. A new component is introduced to render the lemniscate, and a new image view is introduced to consistently show the goal image, placeholder, and lemniscate, when appropriate. Some of the state machines here are somewhat intricate.

Testing:

• Refreshed goals in the app and saw the goal view behaved as expected
• Refreshed goals and the gallery view and observed they behaved as expected

Known bugs:

• When the gallery view refreshes, the lemniscate can skip between locations in the animation
• We trigger a graph update, and thus the lemniscate, when refreshing goals which do not have autodata

[theospears]

• Show lemniscate for queued goals #444 👈
• master

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