Port of storytold/photocraft#2445. Each theme in Settings > Interface gets a
star; starred themes are saved with the settings and listed in a right-click
menu on the title bar's appearance button, next to Appearance Settings, so
switching between favorites takes one click. The theme cards now list one
theme per row to make room for the stars, so the settings dialog test
scrolls further to reach the controls below them.
Luniiya
43662e6959