improve warp transform so it can be used as a general bending tool too.


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@60721 954f8c5b-7b00-dc11-b283-0030488c597c
fix [#37046] Dissolve edges and vertices problem with triangulate
with review and collaboration from Campbell Barton

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@60722 954f8c5b-7b00-dc11-b283-0030488c597c