Better glyph support for \mathcal, \mathbb, \mathscr, etc.

[topological-modular-forms]

Darwin should have extensive glyph support for \mathcal, \mathbb, \mathfrak, etc., including things such as:

1. \mathbb for the lowercase alphabet.
2. \mathbb for Greek.
3. Better support in general for the basic things in all the math scripts, including numbers for \mathbb, lowercase and numbers for \mathscr, etc.
4. Once everything above is done, I could perhaps also design more exotic things like \mathcal or \mathfrak for Greek and Cyrillic, or \mathbb support for $\aleph$ and $\beth$.