Add <D HAL RESET> command to attempt to reset failed devices.

DCCEXParser.cpp

@@ -948,6 +948,8 @@ bool DCCEXParser::parseD(Print *stream, int16_t params, int16_t p[])
     case HASH_KEYWORD_HAL: 
         if (p[1] == HASH_KEYWORD_SHOW) 
           IODevice::DumpAll();
+        else if (p[1] == HASH_KEYWORD_RESET)
+          IODevice::reset();
         break;
 #endif
 

version.h

@@ -19,6 +19,7 @@
 //        (2) animations of servo movement via PCA9685pwm.
 //        This is intended to support EXIOExpander and also
 //        replace the existing PCA9685 driver.
+//        Add <D HAL RESET> to reinitialise failed drivers.
 // 4.2.14 STM32F4xx fast ADC read implementation
 // 4.2.13 Broadcast power for <s> again
 // 4.2.12 Bugfix for issue #299 TurnoutDescription NULL