fix: handle backslashes in embedded template language reasonably #714
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closes #713
This PR updates the handling of template literals with embedded langauges.
This change unescape
\\
sequence before applying external formatters, and escape it back after it.Some css classes needs to use
\
to escape it in css level, and that becomes\\
in template literals. The use of\\
causes syntax error in css formatter (malva, See g-plane/malva#35 ). This change avoids that error.