Serial and pins debug cleanup

- Rename some AVR / DUE / ESP32 serial types
- Reduce two #error to one static_assert
- Update AVR/DUE error messages

Marlin/src/HAL/ESP32/WebSocketSerial.cpp

@@ -29,7 +29,7 @@
 #include "wifi.h"
 #include <ESPAsyncWebServer.h>
 
-MSerialT webSocketSerial(false);
+MSerialWebSocketT webSocketSerial(false);
 AsyncWebSocket ws("/ws"); // TODO Move inside the class.
 
 // RingBuffer impl

Marlin/src/HAL/ESP32/WebSocketSerial.h

@@ -81,5 +81,5 @@ public:
   #endif
 };
 
-typedef Serial1Class<WebSocketSerial> MSerialT;
-extern MSerialT webSocketSerial;
+typedef Serial1Class<WebSocketSerial> MSerialWebSocketT;
+extern MSerialWebSocketT webSocketSerial;