Important Update:

- FunctionCore/SelectableCore:
  - Replace Channel->State with InState
  - Add Channel-OutState (ready for output) updated by ChannelStateEvent()
- TimingCore:
  - Add GetUpCounter() for calculating uptime string (in seconds)

FunctionCore.h

@@ -38,7 +38,8 @@ struct SChannel
 
     TChannelLink    * FirstLink     = NULL;     // List of channels linked for input/output
 
-    EChannelState   State           = CH_off;   // Channel ready to receive input
+    EChannelState   InState         = CH_off;   // Channel ready to receive input (determined by parent function)
+    EChannelState   OutState        = CH_off;   // Channel ready to send output (determined by InStates of linked channels)
 
     TChannel        * Next          = NULL;
 };