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/rsContext.h b/rsContext.h
index 9d96a06..64717e4 100644
--- a/rsContext.h
+++ b/rsContext.h
@@ -108,7 +108,7 @@
 
     void initEGL();
 
-    void runRootScript();
+    bool runRootScript();
 
     static void * threadProc(void *);