usability: more logical ordering of animation buttons

This is a small change. All this does is moves the Delete Animation and Rename Animation options to the left side, with the New, Load, Duplicate buttons. The right side retains the AutoPlay, Blend Times, and Edit Animation buttons. This gives a more logical ordering / grouping of operations.

This also helps differentiate between the Blend and Delete buttons, which look somewhat similar and, currently being right beside each other, can easily be confused, especially at higher resolutions.

It also helps avoid confusing the Delete Animation and Delete Track buttons, which I personally have done many, many times.