physics objects (ActorWithBody) will now sleep if ||v|| < 0.5, faction ID is now positive integer (64-bit) only

Former-commit-id: 437cff82cf5748c36c5ad72bc43b4fc172b168c8
Former-commit-id: 3ab0500f83da229ec77b85c09ec42fd332ef62ce

src/net/torvald/terrarum/gameactors/WeaponSwung.kt

@@ -0,0 +1,12 @@
+package net.torvald.terrarum.gameactors
+
+/**
+ * Created by minjaesong on 16-04-26.
+ */
+class WeaponSwung(val itemID: Int) : ActorWithBody() {
+    // just let the solver use AABB; it's cheap but works just enough
+
+    init {
+
+    }
+}