Highlight SHTML errors

[JamesANZ]

Sometimes you will get a false flag error during make .canonicalized.xml whereby the lint suggests that something is wrong with one of your xml tags, often however, the real issue lies with the SHTML file having something incorrect in it.

[SmartLayer]

The error message's line number doesn't match because xmllint doesn't take entity references. Can you check a bit if 𝑎) did someone work on xmllint to add that feature? and 𝑏) whether or not there is a replacement for xmllint's shortcomings?