Spell fixes by `codespell`

[inkdot7]

For someone wanting some fun with git diff --word-diff and other such games, the nice tool codespell can be used to clean up some misspellings in the sources.

git diff --word-diff is needed to check the results, since not all changes are good. But experience from other places is that it is quite rewarding. The options -L and -w, as well as -i 2 of codespell are useful to look up to.

One does not need to deal with the entire repository at once.

[klenze]

Vaguely related, perhaps we should have an identifier policy.

An identifier:

• Shall be at least eight characters long
• Shall start with the letters "R3B" if it names any type
  (debate: using Unicode, we could transition to R³B instead)
• Shall start with the letter "f" if it names a class member variable
• Shall contain at least one special character, one lowercase letter, and one digit each
• May not be reused in another scope
• Must have a Damerau–Levenshtein distance of at least four with respect to all other identifiers in scope to prevent typos causing bugs
• Variable names must use (Systems) Hungarian notation, plus a postfix denoting the unit

Checking for identifiers in C++ is easy (the hard part is figuring out what they mean), so we could possibly just feed them to some password policy checker.

[inkdot7]

I take it that @klenze 's comment fall in the "Surely You're Joking ?" category.

The original suggestion is intended as a small one-time action unrelated to any CI or policy.

[klenze]

Yes, I was.

No harm in anyone checking and fixing misspellings, I guess. Not in my top ten complaints about the code base, but that may be because I am the one doing the misspelling.