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Fix Ricty font issue on VScode writing backquote

Information in the following like solved pefectly this issue:

Ricty系フォントのバックチックを修正する - Koji Noshita

Here, the copy of the above information is left considering the case that the original information will be lost.

cvt_ricty.pe with chmod 755

Open($1)
Select(0u0060)
SetGlyphClass("base")
Generate($1)

Then

% find ~/Library/Fonts -name "Ricty*.ttf" | xargs -I {} fontforge -lang ff -script cvt_ricty.pe  {}