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WIP: Add progress reporting functionality

Jonathan Maw requested to merge jonathan/progress into master

Description

There are some tasks which can run for a very long time without printing any kind of output to indicate they're still going. This adds a way of reporting progress during that time.

Note: This is very rough around the edges at the moment, and I'd appreciate suggestions on how to make it better.

Changes proposed in this merge request:

  • A new Progress object, which keeps track of the progress made in a task
  • Context is able to generate Progresses in a context manager, and has a single point of entry for outputting progress messages.
  • When loading elements, it keeps a track of the current number of elements loaded, and the current total number of elements to load.
    • Because loading elements involves recursively discovering which elements need to be loaded, the total is not very helpful at the moment.
  • When resolving elements (turning them from a MetaElement into an Element), it keeps track of the number of elements resolved.

This merge request, when approved, will close: #1029

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