Implement numeric blender-style transforms.

This allows the user to input numbers during an "instant" (blender
style) transform operation to specify exactly how far to transform the
object. For example:

g2.5xx: Translate 2.5 units along the local x-axis
ry-45: Rotate -45 degrees around the y-axis
s.25Z: Scale by a factor of .25 on the xy plane

Some shared code between the traslate/rotate/scale branches of update_transform
was refactored into apply_transform so numeric transforms could reuse it.

This removes any "{X,Y,Z}-Axis Transform" messages. These prevented the
"Transforming: (x,y,z)" messages from showing, and the latter are more
useful, as they tell you the actual units.

This also rearranges finish_transform to clear _edit before updating
the axis rendering, so an axis doesn't remain highlighted.

Co-authored-by: Rémi Verschelde <rverschelde@gmail.com>

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