[HAL][LPC176x] Pull out framework into separate repository

Framework and build platform now located at https://github.com/p3p/pio-framework-arduino-lpc176x and https://github.com/p3p/pio-nxplpc-arduino-lpc176x respectively

fix mkssbase leds

move hardware serial

remove hardware/software serial

Hardware Serial extraction

HardwareSerial ISRs

fix disabled serial2 causing Serial object to link

move usb devices out to framework

separate out adc/pwm peripheral function from hal.cpp

fix includes

remove unused pwm init

move adc

HAL header update

templated filtered adc

LPC1769 platform

Marlin/src/HAL/HAL_LPC1768/usb_serial.cpp

@@ -0,0 +1,13 @@
+#ifdef TARGET_LPC1768
+#include "../../inc/MarlinConfigPre.h"
+
+#if ENABLED(EMERGENCY_PARSER)
+  #include "../../feature/emergency_parser.h"
+  EmergencyParser::State emergency_state;
+  bool CDC_RecvCallback(const char buffer) {
+    emergency_parser.update(emergency_state, buffer);
+    return true;
+  }
+#endif // ENABLED(EMERGENCY_PARSER)
+
+#endif // TARGET_LPC1768