Allow aligning attachments with bones outside of Setup Pose.

It's impractical to align certain poses/attachments in Setup Mode. This is especially true with poses that significantly deviate from Setup Pose— e.g. when body parts are at a different visual angle, perspective, configuration or gestural shape, or need different "2D cheats" to get it to look correct.

 

One way to accommodate this is to allow adding and moving attachments in Animate Mode.
However, not allowing moving or adding attachments in Animate Mode is still good to prevent accidentally moving attachments.