How to use custom font in AppKit

Issue #319

• Add fonts to targets
• Declare in Info.plist

https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/GeneralPurposeKeys.html#//apple_ref/doc/uid/TP40009253-SW8

ATSApplicationFontsPath (String - macOS) identifies the location of a font file or directory of fonts in the bundle’s Resources directory. If present, macOS activates the fonts at the specified path for use by the bundled app. The fonts are activated only for the bundled app and not for the system as a whole. The path itself should be specified as a relative directory of the bundle’s Resources directory. For example, if a directory of fonts was at the path /Applications/MyApp.app/Contents/Resources/Stuff/MyFonts/, you should specify the string Stuff/MyFonts/ for the value of this key.

<key>ATSApplicationFontsPath</key>
<string>.</string>

• Reference by name

NSFont(name: "FiraCode-Bold", size: 14)