Clean up the codes of static array desirialization.
The codes of dynamic array still need revisions, because the current code is deserializing to an appender, not deserializing to the array.

    size_t elementCount = 0;
    while(true) {
        // Add a default element to the array so we can deserialize into it
        app ~= typeof(item[0]).init;

        // Create a temporary array that includes this new element
        auto tempArray = app.data;

        policy.onArrayElement(tokenizer, tempArray, elementCount, context);

        // Update our appender with the modified last element
        app.data[elementCount] = tempArray[elementCount];

        elementCount++;

        //get the next token
    }

(https://github.com/schveiguy/jsoniopipe/pull/43)