unfortunately, the string "EXTERN" is defined in rp2040 headers

I renamed the enum member EXTERN to EXTERNAL. For consistency, I also
renmaed INTERN.

Author: runger1101001

src/common/base_classes/Sensor.h

@@ -15,8 +15,8 @@ enum Direction{
  *  Pullup configuration structure
  */
 enum Pullup{
-    INTERN, //!< Use internal pullups
-    EXTERN //!< Use external pullups
+    INTERNAL, //!< Use internal pullups
+    EXTERNAL //!< Use external pullups
 };
 
 /**
@@ -43,4 +43,4 @@ class Sensor{
         long velocity_calc_timestamp=0; //!< last velocity calculation timestamp
 };
 
-#endif
+#endif

src/sensors/Encoder.cpp

@@ -32,7 +32,7 @@ Encoder::Encoder(int _encA, int _encB , float _ppr, int _index){
   prev_timestamp_us = _micros();
 
   // extern pullup as default
-  pullup = Pullup::EXTERN;
+  pullup = Pullup::EXTERNAL;
   // enable quadrature encoder by default
   quadrature = Quadrature::ON;
 }
@@ -160,7 +160,7 @@ int Encoder::hasIndex(){
 void Encoder::init(){
 
   // Encoder - check if pullup needed for your encoder
-  if(pullup == Pullup::INTERN){
+  if(pullup == Pullup::INTERNAL){
     pinMode(pinA, INPUT_PULLUP);
     pinMode(pinB, INPUT_PULLUP);
     if(hasIndex()) pinMode(index_pin,INPUT_PULLUP);

src/sensors/HallSensor.cpp

@@ -17,7 +17,7 @@ HallSensor::HallSensor(int _hallA, int _hallB, int _hallC, int _pp){
   cpr = _pp * 6; 
 
   // extern pullup as default
-  pullup = Pullup::EXTERN;
+  pullup = Pullup::EXTERNAL;
 }
 
 //  HallSensor interrupt callback functions
@@ -119,7 +119,7 @@ void HallSensor::init(){
   electric_rotations = 0;
 
   // HallSensor - check if pullup needed for your HallSensor
-  if(pullup == Pullup::INTERN){
+  if(pullup == Pullup::INTERNAL){
     pinMode(pinA, INPUT_PULLUP);
     pinMode(pinB, INPUT_PULLUP);
     pinMode(pinC, INPUT_PULLUP);

src/sensors/MagneticSensorAnalog.cpp

@@ -13,7 +13,7 @@ MagneticSensorAnalog::MagneticSensorAnalog(uint8_t _pinAnalog, int _min_raw_coun
   min_raw_count = _min_raw_count;
   max_raw_count = _max_raw_count;
 
-  if(pullup == Pullup::INTERN){
+  if(pullup == Pullup::INTERNAL){
     pinMode(pinAnalog, INPUT_PULLUP);
   }else{
     pinMode(pinAnalog, INPUT);