Add support for these ranges

Issue from @frankfolf on GlyphBrowser repo:
https://github.com/LettError/glyphBrowser/issues/27

```
U+2900-U+297F	Supplemental Arrows-B
U+2980-U+29FF	Miscellaneous Mathematical Symbols-B
U+2A00-U+2AFF	Supplemental Mathematical Operators
U+2B00-U+2BFF	Miscellaneous Symbols and Arrows
```