WIP: MsgPack stubs, Level Filesystem Module

* Add some encoding/decoding functions for binary msgpack format for
  levels and doodads. Currently it writes msgpack files that can be
  decoded and printed by Python (mp2json.py) but it can't re-read from
  the binary format. For now, levels will continue to write in JSON
  format.
* Add filesystem abstraction functions to the balance/ package to search
  multiple paths to find Levels and Doodads, to make way for
  system-level doodads.

dev-assets/doodads/azulian/azulian.js

@@ -1,4 +1,52 @@
 function main() {
 	log.Info("Azulian '%s' initialized!", Self.Doodad.Title);
-	Self.ShowLayer(2);
+
+	var playerSpeed = 12;
+	var gravity = 4;
+	var Vx = Vy = 0;
+
+	var animating = false;
+	var animStart = animEnd = 0;
+	var animFrame = animStart;
+
+	setInterval(function() {
+		if (animating) {
+			if (animFrame < animStart || animFrame > animEnd) {
+				animFrame = animStart;
+			}
+
+			animFrame++;
+			if (animFrame === animEnd) {
+				animFrame = animStart;
+			}
+			Self.ShowLayer(animFrame);
+		} else {
+			Self.ShowLayer(animStart);
+		}
+	}, 100);
+
+	Events.OnKeypress(function(ev) {
+		Vx = 0;
+		Vy = 0;
+
+		if (ev.Right.Now) {
+			animStart = 2;
+			animEnd = animStart+4;
+			animating = true;
+			Vx = playerSpeed;
+		} else if (ev.Left.Now) {
+			animStart = 6;
+			animEnd = animStart+4;
+			animating = true;
+			Vx = -playerSpeed;
+		} else {
+			animating = false;
+		}
+
+		if (!Self.Grounded()) {
+			Vy += gravity;
+		}
+
+		// Self.SetVelocity(Point(Vx, Vy));
+	})
 }