[VariableBox] Added sequences to the variable box

It is now possible to call the value of a defined sequence anywhere.

Change-Id: I1990e93c50f9add175b7ea274e07004ba63289e5

apps/shared/shared_app.cpp

@@ -0,0 +1,10 @@
+#include "shared_app.h"
+#include "global_context.h"
+#include <apps/apps_container.h>
+
+void SharedApp::Snapshot::pack(App * app) {
+  /* Since the sequence store is now accessible from every app, when exiting
+   * any application, we need to tidy it.*/
+  static_cast<Shared::GlobalContext *>(AppsContainer::sharedAppsContainer()->globalContext())->sequenceStore()->tidy();
+  App::Snapshot::pack(app);
+}