Mostly just the result of running `blender_icons_update.py` without adding or changing any icon source files. Removal of three unused icons and adding three others to the project to resolve conflicts between them.
Pull Request: https://projects.blender.org/blender/blender/pulls/114874
I had to make the viewport navigation icons a bit smaller in the SVG since
the edges were being clipped off, we only support 16x16 icons currently.
They are a bit blurry because of this.
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.