* Drop icon sources (svg) we no longer use
* Rename some icons to better match their content
* Drop chevron/console prompt icon
We do not show it in Dash specific themes and Traditional is just fine with a simple ">" label
* bitcoin -> dash for icons
* Adjust `contrib/debian/copyright`
Dashify it + we no longer use icons mentioned there
* `mogrify src/qt/res/*/*.png`
* `python3 contrib/devtools/optimize-pngs.py`
Total reduction: 68072 bytes
