ElegantPaper v0.07

Main work

• remove the default font size setting [fix].
• finally fix the math fonts, operators [fix].
• remove the xeCJK font settings [enhancement].
• add GB/T 7714-2015 bib style support [new].
• new bib file, double check the information [enhancement].
• simplify the guide [enhancement].
• get back to cmtt font for tt family [enhancement].
• add inline option for enumitem package [enhancement].

NOTES: Users do not need install any fonts anymore.