ElegantBook v4.1

• Big Change : Change the bibliography method from BiBTeX to biblatex;
• Big Change: Add support for the default theorem writing method (with optional name and label);
• Add left and right space;
• Support hyperlink from the text of TOC;
• Remove the pdfLaTeX compatiblity check for Chinese.
• Add multilingual support, for
  • French lang=fr,
  • Dutch lang=nl,
  • Hungarian lang=hu ,
  • Spanish lang=es,
  • Mongolian lang=mn etc.