Deprecate ear

Posted under Tags

The bulk update request #10101 has been approved by @Hillside_Moose.

remove alias ear -> ear_focus
deprecate ear

I'm assuming ear was aliased to ears at some point, which is what led it to be aliased to ear_focus after that tag's creation and the ears cleanup. In any case, this prevents it from users adding ear to any post where an ear is visible.