Rename RawString to Educe__RawString

[ijackson]

Addresses the RawString part of #18. (The MyDebug part is in #19).

I did a git-grep which I hoped would find other helper structs emitted in the output. I didn't find any.

It's possible that there are still variable or type name clashes. I suggest we deal with those as we find them.

[ijackson]

CI failures here seem spurious; they're happening in my other MRs too.