解析时in 缺失 && 切片语法优化

[tanyanliang110]

问题#56

$\qquad$测试’add_key("t5", x in function(tags=false))‘发现in语法解析没有问题，是函数调用的问题
$\qquad$发现in语法解析时缺省了in 如‘x in [1,2,3]' 解析为 x [1,2,3]
原因：newInExpr函数结构体没有写Op，加上就好了

切片语法

$\qquad$支持各种调用作为obj和索引，包括但不限于函数调用，表达式调用。
$\qquad$要求解析到最后obj必须为字符串、数组或切片，索引必须为整数。

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