New icons from Andrzej Ambroż / jendrzych:
-Adds separate icons for 3D Cursor orientation and pivot
Also, many dozens of tweaks and updates - too many to mention here.
Full list is on Devtalk
this allows for updating icons without committing a new PNG each time
(which is inefficient with git). The data files are converted into a
PNG at builds time and used just as they were before.