Media Grid: Remove fields from showing in the grid itself.

All details are still available within the modal, and less-distinguishable non-image files still show the filename along with the file type icon.

Reverts [29079], [29078], [29077], and [28995]. see #24716.

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Set default values for attachment meta and ID3 data when preparing for JS to avoid errors in rendering templates. props ericmann for the initial patch. fixes #29013.

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Media Grid: Manage focus when toggling between the grid and an edit attachment modal

Props adamsilverstein for the initial patch.
Fixes #28857.

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The Underscore templates for Gallery settings should respect defaults when marking an `<option>` as `selected`.

See #28693.

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When gallery settings are overridden, the JS-generated shortcodes need to check the new defaults before deleting attributes that it suspects are the same as the original default values.

`wp.media.collection` has a new method to do this: `setDefaults()`.	Also flips the use of `_.extend` to allow this method to be overriden on instance creation.

See #28693.

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