Blender Git Loki

Review: Added Exception safety, some minor improvements and works as
intended.

Review: added comments, doc strings, improvements, support for random vertices

Merge branch 'master' into soc-2020-testing-frameworks

Updating with master

Tests: almost finished with the protoype, added support for
generating vertex groups from script.

Some minor improvements left, work in progress, saving.

Tests: created a prototype for generating blend objects for modifiers
regression tests

Work in progress, saving.