Anchors on figures and listings

[elbow-jason]

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I have noticed that there are anchor tags on sections and subsections. It would be nice to have anchor tags on the figures' names as well. For example (from the book):

Listing 5-15: Implementing the can_hold method on Rectangle that takes another Rectangle instance as a parameter

The text Listing 5-15 would be a clickable/fragment-navigable link just like sections and subsections.