Improve errors & warnings due to fancy quoted vars (Bug#32939)
Add some hints to the message for byte compiler free & unused variable warnings, and 'void-variable' errors where the variable has confusable quote characters in it. * lisp/help.el (uni-confusables), uni-confusables-regexp): New constants. (help-command-error-confusable-suggestions): New function, added to `command-error-function'. (help-uni-confusable-suggestions): New function. * lisp/emacs-lisp/bytecomp.el (byte-compile-variable-ref): * lisp/emacs-lisp/cconv.el (cconv--analyze-use): Use it. * lisp/emacs-lisp/lisp-mode.el (lisp--match-confusable-symbol-character): New function. (lisp-fdefs): Use it to fontify confusable characters with font-lock-warning-face when they occur in symbol names. * doc/lispref/modes.texi (Faces for Font Lock): * doc/lispref/objects.texi (Basic Char Syntax): Recommend backslash escaping of confusable characters, and mention new fontification. * etc/NEWS: Announce the new fontification behavior. * test/lisp/emacs-lisp/lisp-mode-tests.el (lisp-fontify-confusables): New test.
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