Fix the issues for \text from testfont.tex when using XeTeX

[razvanm]

TeX comes with a small (testfont.tex)[https://ctan.org/pkg/testfont] for testing fonts. One of the commands from there is called \text and it prints a bunch of test with various special characters. It would be nice to make this work properly when using XeTeX and pointing to the .otf font.

Here is a list of the issues I noticed:

• --- should generate a Em Dash (—, U+2014)
• two consecutive backticks should generate a Left Double Quotation Mark (“, U+201C)
• two consecutive single quotes should generate a Right Double Quotation Mark(”, U+201D)
• ?` should generate a Inverted Question Mark (¿, U+00BF)
• !` should generate a Inverted Exclamation Mark (¡, U+00A1)
• Latin Small Letter Sharp S (ß, U+00DF)
• Latin Capital Letter Ae (Æ, U+00C6)
• Latin Capital Ligature Oe (Œ, U+0152)
• Latin Small Letter I with Diaeresis (ï, U+00EF)
• Latin Small Letter Ae (æ, U+00E6)
• Latin Small Letter A with Grave (à, U+00E0)
• Latin Small Ligature Oe (œ, U+0153)
• the accent is too close to the letter for Latin Small Letter O with Circumflex (ô, U+00F4)
• Latin Small Letter E with Acute (é, U+00E9)
• Apostrophe (', U+0027) is used instead of Right Single Quotation Mark (’, U+2019) for words like "aren't".

Example:

The above was produced using is testfont-text.tex and the running the following commands:

xetext testfont-text.tex
gs -dBATCH -dNOPAUSE -sDEVICE=pnggray -dBackgroundColor=16#ffffff -sOutputFile=testfont-text.png -r576 testfont-text.pdf