Refactored for teensy 4.0, xEvi hardware

- Switched to platformio, ino -> cpp
- MPRLS for pressure sensor
- Added basic ICM support
- Removed widi, battery, other features not supported in xEvi
- Removed legacy options/processing
- Added LED strip support
- Added encoder support
- Reworked menu code to use encoders/be more flexible

NuEVI/src/led.cpp

@@ -0,0 +1,49 @@
+#include <Arduino.h>
+#include "hardware.h"
+#include "globals.h"
+#include "config.h"
+
+void singleLED(int n, int color) {
+}
+
+void ledFullMeter(byte indicatedValue, int color){
+}
+
+void ledHalfMeter(int n, byte indicatedValue, int color){
+}
+
+void ledQuarterMeter(int n, byte indicatedValue, int color){
+}
+
+void statusLedOn() {
+  digitalWrite(statusLedPin, HIGH);
+}
+
+void statusLedOff() {
+  digitalWrite(statusLedPin, LOW);
+}
+
+void statusLed(bool state) {
+  digitalWrite(statusLedPin, state);
+}
+
+void statusLedFlip() {
+  digitalWrite(statusLedPin, !digitalRead(statusLedPin));
+}
+
+void statusLedFlash(uint16_t delayTime) {
+  statusLedOff();
+  delay(delayTime/2);
+  statusLedOn();
+  delay(delayTime/2);
+}
+
+void statusLedBlink() {
+  statusLedFlash(300);
+  statusLedFlash(300);
+}
+
+void updateSensorLEDs() {
+  ledHalfMeter(1, state.breathCCVal, 0x00FF00);
+  ledQuarterMeter(3, state.biteVal, 0x0000FF);
+}