Syntax update for Solidity 0.8.5: Add verbatim builtin in assembly

[haltman-at]

This PR adds highlighting for the verbatim family of assembly builtins introduced in 0.8.5. Rather than handling these by the crazy way I handled fixed-point types (I should probably redo those at some point...) I just used a regular expression. So this means it gets its own mode rather than just being a keyword.

Also, while I was at it, I added a second commit to require that numbers are followed by a word break, since we didn't have that previously.

[haltman-at]

@frangio @joshgoebel @marcoscaceres @pospi Hey, does anyone know who has permission to add people to this repo? @frangio has said he no longer has time to help out with this, so I need someone else who can check my work, including the Solidity-specific parts. However I don't seem to have permission to add people to this repo so I can ask them for reviews.

[joshgoebel]

I can. Who would you like added.

[haltman-at]

Well, I asked other people here at Truffle, and @cds-amal and @eggplantzzz have both said they'd be willing to do this. :)

[joshgoebel]

Added with Write permissions.

[haltman-at]

Thank you!

[cds-amal]

Is it possible to add tests for these changes?

[haltman-at]

Well, the current way we have tests set up is not great, so testing is a bit difficult (we don't have tests for most things...) but I could add a quick test that verbatim is indeed highlighted.

[haltman-at]

OK, I added a quick test, if it helps.

[cds-amal]

TY @haltman-at ! It does help, and now this looks good to me!