Request to add calligraphic/script and Fraktur letters

[apoorvpotnis]

This is a request to add the script/calligraphic and Fraktur letters to the fonts. These are used in mathematics and can also be used in theorem prover software such as Lean. Note that the letters need to be unmodulated/sans-serif if the surrounding font is unmodulated/sans-serif (Neon, Radon and Krypton).