Shorter paths to HAL, ExtUI (#17156)

Marlin/src/HAL/AVR/MarlinSerial.cpp

@@ -55,7 +55,7 @@
   // A SW memory barrier, to ensure GCC does not overoptimize loops
   #define sw_barrier() asm volatile("": : :"memory");
 
-  #include "../../feature/emergency_parser.h"
+  #include "../../feature/e_parser.h"
 
   // "Atomically" read the RX head index value without disabling interrupts:
   // This MUST be called with RX interrupts enabled, and CAN'T be called

Marlin/src/HAL/DUE/MarlinSerial.cpp

@@ -45,7 +45,7 @@ template<typename Cfg> typename MarlinSerial<Cfg>::ring_buffer_pos_t MarlinSeria
 // A SW memory barrier, to ensure GCC does not overoptimize loops
 #define sw_barrier() asm volatile("": : :"memory");
 
-#include "../../feature/emergency_parser.h"
+#include "../../feature/e_parser.h"
 
 // (called with RX interrupts disabled)
 template<typename Cfg>

Marlin/src/HAL/DUE/MarlinSerialUSB.cpp

@@ -34,7 +34,7 @@
 #include "MarlinSerialUSB.h"
 
 #if ENABLED(EMERGENCY_PARSER)
-  #include "../../feature/emergency_parser.h"
+  #include "../../feature/e_parser.h"
 #endif
 
 // Imports from Atmel USB Stack/CDC implementation