Adaptive place bubble/place bar

Merged James Westman requested to merge jwestman/gnome-maps:scrollable-place-bubble into master

Adds an adaptive mode for place bubbles. When the screen is narrow, the place bubble is replaced by a bar at the bottom of the screen. Clicking this bar will bring up a dialog with the same contents as the place bubble.

Also in this MR: Allow the place bubble to scroll if it's too tall, instead of clipping outside the main window.

Edited by James Westman

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