Pin state reporting of all pins. Flash optimization.

- New pin state realtime reporting feature. Instead of `Lim:000` for
limit state reports, the new feature shows `Pin:000|0|0000`, or
something similar. The `|` delimited fields indicate xyz limits, probe,
and control pin states, where 0 is always not triggered, and 1 is
triggered. Invert masks ARE accounted for.
  Each field may be enabled or disabled via the `$10` status report
setting. The probe and control pin flags are bits 5 and 6, respectively.

- Remove the now deprecated `REPORT_CONTROL_PIN_STATE` option in
config.h

- The old limit pin reports `Lim:000` may be re-enabled by commenting
out `REPORT_ALL_PIN_STATES` in config.h.

- Incremented the version letter (v1.0c) to indicate the change in
reporting style.

- Replaced all bit_true_atomic and bit_false_atomic macros with
function calls. This saved a couple hundred bytes of flash.

grbl/stepper.c

@@ -349,7 +349,7 @@ ISR(TIMER1_COMPA_vect)
     } else {
       // Segment buffer empty. Shutdown.
       st_go_idle();
-      bit_true_atomic(sys_rt_exec_state,EXEC_CYCLE_STOP); // Flag main program for cycle end
+      system_set_exec_state_flag(EXEC_CYCLE_STOP); // Flag main program for cycle end
       return; // Nothing to do but exit.
     }  
   }