Fix bug #35450, bevel make large spikes sometimes.
Needed special case for when beveled edge is
antiparallel to an adjacent edge.

Fix bug #34611: bevel overlap limit
The previous fix limited overlap, but is sometimes
too conservative, and artists want way to turn off
the limiting, so added 'Allow Overlap' option to
modifier.

Fix bevel modifier bug #34611, limit bevel amount needed.

This is a quick fix that perhaps overestimates the point
of first geometry collision, but at least for now it should
allow models that used the old modifier and a too-big
bevel amount to not look awful.

The correct solution to this problem is much more involved
and I'll get to it later.

Enable new bevel tool code in bevel modifier.

Now modifier takes a segments parameter.
Bevel edge weights will multiply the overall amount.
For vertex-only, you can give a vertex group name,
and the weights in that will multiply the overall amount.

Fix Knife cut-through bug #34072.

Fix bevel bug #33906, unwanted distortion with skewed meshes.

The code for making a rounded profile edge at a vertex needed
a special case for when that profile is on the third face
(the one not touched by the beveled edge) when only one edge
is beveled and the three faces are not orthogonal.

Vertex bevel: adjust vertex positions to make a more rounded pattern.
Also fixed debug quad drawing code to not join successive quads.

Add (vertex-only) Bevel to Mesh > Vertex menu.

Bevel vertex: fix rebuild of faces so they are connected when seg > 1.

Bevel vertex only (shortcut: control-shift-B) initial commit.