Edit attachment display properties in the media modal

[koopersmith]

The global attachment display properties should be editable from the media modal — these control how images are inserted into any editor. While images can be inserted in bulk, these settings should not be per-image, as there are not robust controls for the order of image insertion either (i.e. they are bulk properties for a bulk action).

[koopersmith]

In [22247]:

Add attachment display settings to the media modal.

• Add a media view for button groups.
• Add button dropdown containers.
• Add a dropdown property to the button media model.

fixes #22206, #21814, see #21390, #21813, #21598.

[lessbloat]

This is looking really slick.

One thing that made me pause (if only momentarily) was that once I changed my display properties I didn't see a way to save them:

After looking for a second, I guessed that the "Insert into post" button likely still worked (and it did), but the point is, I had to stop and think about it.

Could we do something like this:

Which sits just over the top of the first button?

[nacin]

After looking for a second, I guessed that the "Insert into post" button likely still worked (and it did), but the point is, I had to stop and think about it.

koopersmith and I had mocked up a second button at the bottom (which is likely less jarring as it feels like less of an AYS). Either way, something needs to be done.

[koopersmith]

In 22493:

Media: Add size dropdown to attachment display settings in the media modal. fixes #22206, see #21390.