WIP: Add new icon

TODO:

- [ ] Credit Tobias in About dialog
- [ ] Check build system actually DTRT

Fixes #17
2 jobs for 17-new-icon in 20 minutes and 13 seconds
Status Job ID Name Coverage
  Lint
passed #1914977
lint

00:01:49

 
  Build
passed #1914978
stack-build-test

00:18:23