Crease UI improvements

Crease for Edges & Vertices is a continuous parameter, but the UI currently treats it as a boolean toggle: if crease != 0 draw vertex or edge in pink.

I'm asking for:

1. visual feedback of "how creased is it?"
2. a friendlier tool / widget to let me tweak & re-tweak crease.

In EDIT-mode, an Edge is a line. I suggest drawing a short 2nd line across the middle of the line (a "hash"), where the apparent angle is proportional to the Crease value. Parallel (angle 0) means Crease = zero. Perpendicular means Crease = 1 (or max). A new tool in the left-side (T) toolbar could support a widget mode to grab these "hashes" and directly adjust their angle = crease-value.

In EDIT-mode, a Vertex is a small dot. I suggest morphing this into a just slightly larger square-dot or an "X", again with the same toolbar tool / widget allowing me to reach in and grab a corner of the little square or "X" to tweak the vertex's crease value. Size of square/X proportional to crease value within limits.

Vertices and Edges could still be drawn in pink when creased with extra visual value-hints described above.

The "after-operator" adjust panel in the lower-left corner of the Viewport currently works with a "factor" value. Can we change this to the absolute-value of the crease for whatever I just changed?

I'm enjoying and finding new niches for Creasing, I just wish they were easier to work with and perceive.

Thanks for blender!