avr: most stuff for SensorWatch implemented.

avr/modules/lcd2/gui2/TODO

@@ -12,23 +12,14 @@
 
 - sensor watch:
   - SDRAM vars:
-    - nodeAddr
+    - change limits to areas?
-    - variableId
+    - add private flags (HAVE_VALUE, USE_WARNLIMIT, USE_CRITLIMIT)
-    - currentValue
+
-    - threshold yellow
-    - threshold red
   - widgets:
-    - title (label)
-    - image (imageView)
     - value (flashingLabel)
 
-  - routines:
-    - setValue()
 
-  - routines in app:
+
-    - onMsgReceived:
-      - filter-out reportValue
-      - filter-out setValue msgs (to select sensors)