Add check that regular and unicode string literals are well formatted

libsolidity/parsing/Parser.cpp

@@ -1782,6 +1782,7 @@ ASTPointer<Expression> Parser::parsePrimaryExpression()
 		}
 		break;
 	case Token::StringLiteral:
+	case Token::UnicodeStringLiteral:
 	case Token::HexStringLiteral:
 	{
 		string literal = m_scanner->currentLiteral();