Make Removing Attachments Easier from Attachments Menu

It would be sweet to have a small round "x" icon next to each attachment in the attachment menu.

Clicking the "x" would strikethrough the attachment name and grey it out but leave it in the list.

The "x" icon would also change to an "undo" arrow.

Clicking the "undo" icon would reattach the attachment to the email.

This behavior could be duplicated in the attachment list at the bottom of the email as well.

This would allow folks to fix miss-clicks where the accidentally remove the wrong attachment.

It would also remove the need to have a sub-menu for "removing attachments".