add json parsing of lists and maps

jsontest/complex.json

@@ -0,0 +1,9 @@
+{
+	"planets": [
+		{ "ship_count": 2, "x": -2.0, "y": 0.0, "owner": 1, "name": "your planet" },
+		{ "ship_count": 4, "x": 2.0, "y": 0.0, "owner": 2, "name": "enemy planet" },
+		{ "ship_count": 2, "x": 0.0, "y": 2.0, "owner": null, "name": "neutral planet" }
+	], "expeditions": [
+		{ "id": 169, "ship_count": 8, "origin": "your planet", "destination": "enemy planet", "owner": 1, "turns_remaining": 2 }
+	]
+}

jsontest/float.json

@@ -0,0 +1 @@
+1.231

jsontest/list.json

@@ -0,0 +1 @@
+["asdf", 1, 2]

jsontest/null.json

@@ -0,0 +1 @@
+null

jsontest/number.json

@@ -0,0 +1 @@
+2

jsontest/simplestring.json

@@ -0,0 +1 @@
+"asdf"