Move Xcode project to a separate tree parallel to src

pkg/pack-scenario.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+# Usage: pack-scenario.sh scenario-folder scenario-filename
+
+rm -f "$2"
+cd "$1/.."
+mv "$1" scenario
+tar -czf "$2" scenario
+mv scenario "$1"
+