Add math parser support for shadowing builtin identifiers and introduce \ as a prefix to reach the builtins - #4562
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…fix reaching the builtin Constants resolve at evaluation time, after the environment, so a binding of any spelling, word or typeset symbol, shadows the builtin of exactly that spelling, and a host-supplied function likewise shadows a builtin function. The `\` prefix, in LaTeX's habit, names the language's own constant or function regardless of bindings (`\pi`, `\e`, `\sin`), and is an error when no builtin has that name.
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Partly closes #2026