Add support for scripts to return an animation flag.  This allows them to indicate they are generating changing content and the rs thread to sleep if the content is static.
diff --git a/libs/rs/rsScript.h b/libs/rs/rsScript.h
index 1932870..0229860 100644
--- a/libs/rs/rsScript.h
+++ b/libs/rs/rsScript.h
@@ -46,7 +46,7 @@
 
     ObjectBaseRef<Allocation> mSlots[16];
 
-    virtual void run(Context *, uint32_t launchID) = 0;
+    virtual bool run(Context *, uint32_t launchID) = 0;
 };