avr: added forwarder app.

simpler than router app, just for forwarding messages between interfaces.
mainly used by t03.

avr/devices/all/apps.asm

@@ -37,6 +37,10 @@ initApps:
   bigcall AppHub_Init
 #endif
 
+#ifdef APPS_FORWARDER
+  bigcall AppForwarder_Init
+#endif
+
 #ifdef APPS_MOTION
   bigcall AppMotion_Init
 #endif
@@ -79,7 +83,17 @@ runApps:
 #endif
 
 #ifdef APPS_HUB
-  bigcall AppHub_Run
+  push r16
+    bigcall AppHub_Run
+  pop r16
+  sbci r16, 0              ; decrease r16 only if CFLAG set
+#endif
+
+#ifdef APPS_FORWARDER
+  push r16
+    bigcall AppForwarder_Run
+  pop r16
+  sbci r16, 0              ; decrease r16 only if CFLAG set
 #endif
 
   ; add more modules here