actors are now active/dormant depending on the distance to the player, only the active actors are to be updated. Actors outside of the camera (actually a distance to the player) are not rendered

Former-commit-id: 5f80c2ef3592aab5567723087c264e05458e98b3
Former-commit-id: 7714c6f5a6d7a48d4f5adfe8f6990b249bdb80b0

src/net/torvald/terrarum/console/Version.kt

@@ -0,0 +1,16 @@
+package net.torvald.terrarum.console
+
+import net.torvald.terrarum.VERSION_STRING
+
+/**
+ * Created by minjaesong on 16-04-23.
+ */
+class Version : ConsoleCommand {
+    override fun execute(args: Array<String>) {
+        Echo().execute(VERSION_STRING)
+    }
+
+    override fun printUsage() {
+        Echo().execute("Prints out current version of the application")
+    }
+}