Spelling fixes, three bug fixes and one compile fix.

[PJBrs]

This PR contains three patches. One corrects spelling from sorceror to sorcerer. I've added a check that still accepts sorceror as class in a character file to keep backwards compatibility.

Another patch adds loads and loads of spelling fixes, as well as various formatting fixes. I've gone over several files semi-structuredly. Only the bloodhunter files are still very hard to check, and they do contain various spelling errors.

A final patch, I think, contains a bug fix, where the VERSION file isn't added to the package anymore since the move to the pyproject.toml file. I haven't made a bug report for that one, but at least for me the resulting package without the third patch did not work.