Add-on "Advanced Transform" for Blender 2.80.
Porting add-on "Advanced transform" from Blender 2.7 to Blender 2.8.
advanced_transform_2_8.py - Add-on v.0.2.1 for Blender 2.8. No critical changes to the source code, only adopting for Blender 2.8.
source/advanced_transform_2_7 - source add-on v.0.2 for Blender 2.7 by Denis Urchenko