San Francisco fonts for X11

Makes San Francisco, Apple's system typeface, the default font for X11 apps on your jailbroken device, and makes the rest of the built-in iOS fonts (emoji, CJK, and so on) available too.

No font files are copied. It points the font system at iOS's own `/System/Library/Fonts`, so it always matches the OS and there's nothing to license or update.

• Default sans-serif, serif, and UI font: San Francisco
• Default monospace font: SF Mono
• Refreshes the font cache on install

Useful for anything that draws text in X11 apps (terminals, GTK/Qt apps, window managers). Built for iPadOS/iOS rootless (palera1n/Dopamine, `/var/jb`).