Add support for escaping raw expressions (TVAR) #54
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Fixes Issue #1084
Escaping raw expressions (TVAR) is supported by Handlebars.js, but Handlebars.java currently only supports escaping normal expressions (VAR). It is a simple fix to also support escaping raw expressions by updating
varEscapeto first check with the extra curly bracket in the delimiters likestart + "{"andend + "}", then otherwise check with the normal start and end delimiters like before. The visitEscape function doesn't need to change since the ignoring behavior is the same, we only care to drop the escape character.