Created by: zeffii
Addressed problem description
blender 2.93 (feb 21) changed the behaviour of an undocumented portion of the bpy API. this patch aims to let sverchok work in Blender 2.93 before and after that change, by providing a function that detects if the new API is present or not. The function uses the old undocumented "unpacking" method if it doesn't find the new api, and it uses direct property lookup .function and .keywords if it can.