Add Forth constants: BIN and FORTH-WORDLIST. - #2

Ping @infininight!

Can you provide some documentation for this change? The forth grammar isn't something I've really looked at before so I'm not aware if a language spec exists or if this is one of those languages with varied interpretations of the spec depending on the compiler.

This is from the Forth 2012 standard:
https://forth-standard.org/standard/file/BIN
https://forth-standard.org/standard/search/FORTH-WORDLIST

Looking at those two pages there are a whole lot of similar items in the sidebar, the grammar doesn't match the majority of them. Is there are reason these two are should be called out?

Those two are the only constants in the Forth 1994 standard that are missing from the grammar. Most other words in the sidebar are not constants. R/W, R/O, and W/O are constants, but they are already part of the grammar. I think S" and ( are also covered. The other words doesn't seem to need special treatment.

I provided links to the 2012 standard. I haven't checked which new words it adds.