✨ support JSON.

[crossoverJie]

• Support JSON function.
• string support ^^.

Complete println class array:

Person[] list = {p1,p2};
// [[1 a] [1 b]]
println(list);

class Person{
	int age;
	string name;
	float weight;
	bool man;
	Person(string n, int a, float w, bool m){
		name = n;
		age = a;
		weight = w;
		man =m;
	}
}
Person p1 = Person("abc",10,99.99,true);
string json = JSON(p1);
println(json);

int age = JSONGet(json, "age");
println(age);
assertEqual(age,10);

string man = JSONGet(json, "man");
println(man);
assertEqual(man,true);

string name = JSONGet(json, "name");
println(name);
assertEqual(name,"abc");

float weight = JSONGet(json, "weight");
println(weight);
assertEqual(weight,99.99);

string j=^{"age":10, "abc":{"def":"def"},"list":[1,2,3]}^;
String def = JSONGet(j, "abc.def");
println(def);
assertEqual(def,"def");
int l1 = JSONGet(j, "list[0]");
println(l1);
assertEqual(l1,1);


string str=^
{
    "name": "bob",
    "age": 20,
    "skill": {
        "lang": [
            {
                "go": {
                    "feature": [
                        "goroutine",
                        "channel",
                        "simple",
                        true
                    ]
                }
            }
        ]
    }
}
^;
String g = JSONGet(str, "skill.lang[0].go.feature[0]");
println(g);
assertEqual(g,"goroutine");