* Issue #62 Added Show in Dock, System Tray Toggle
* show dock toggle for mac only
* Add Open Heynote and Quit Heynote to Tray context menu
* Add Template Image as menu bar icon on MacOS
https://www.electronjs.org/docs/latest/api/native-image#template-image
* Use isMac, isWindows and isLinux for platform checks
* Add new tray/favicon
* Use favicon.ico as windows tray icon
* Show window on Tray double-click
* Open window when Tray is single clicked on non Mac platforms
* Fix indentation
* Remove unused import
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Co-authored-by: Jonatan Heyman <jonatan@heyman.info>
