Add new json_object_array_sort function

- uses libc's qsort to sort the arraylist
 - add test in test1.c

test1.expected

@@ -13,6 +13,20 @@ my_array=
 	[3]=null
 	[4]=5
 my_array.to_string()=[ 1, 2, 3, null, 5 ]
+my_array=
+	[0]=3
+	[1]=1
+	[2]=2
+	[3]=null
+	[4]=0
+my_array.to_string()=[ 3, 1, 2, null, 0 ]
+my_array=
+	[0]=null
+	[1]=0
+	[2]=1
+	[3]=2
+	[4]=3
+my_array.to_string()=[ null, 0, 1, 2, 3 ]
 my_object=
 	abc: 12
 	foo: "bar"