Add filters to audio & video miscellaneous sections

[desrosj]

Attachments receive a default list of attributes printed in the miscellaneous section of the publish meta box.

Adding a filter to this would allow for the addition or subtraction of specific attributes without having to hook into the attachment_submitbox_misc_actions action.

This would be useful if I wanted to not show the year, or if I wanted to show the channel and encoder information on media heavy sites.

[desrosj]

Adds manage_media_misc_sections & manage_audio_misc_sections filters for adding or removing of sections on attachment edit screens.

[helen]

In 25296:

Add media_submitbox_misc_sections and audio_submitbox_misc_sections filters to allow removing or adding of attachment submitbox sections containing attachment metadata. props desroj, DrewAPicture. fixes #25171.

[helen]

In 25297:

Add dynamic classes for attachment metadata submitbox sections. see #22333, #25171.

[helen]

In 25300:

Alignment standards for [25296]. props DrewAPicture. see #25171.