public String getTargetStringLiteralFromString(String s) {
		return getTargetStringLiteralFromString(s, true);
	}
Escape the Unicode code point appropriately for this language
and append the escaped value to {@code sb}.
It exists for flexibility and backward compatibility with external targets
The static method {@link UnicodeEscapes#appendEscapedCodePoint(StringBuilder, int, String)} can be used as well
if default escaping method (Java) is used or language is officially supported
tool/src/org/antlr/v4/codegen/Target.java