Plugin: 🎨 macOS theme for Joplin

[bre]

@andrejilderda, it appears that your plugin is crushing joplin during update from 2.10.17 to either 2.10.18 or 2.10.19 - please see my post here: Joplin 2.10.18 does not open after update from 2.10.17 - #4 by bre