Enable telemetry and I2C sensors on STM32WL (except accelerometers) (#7008)

* Update platformio inis for stm32 platform and wio-e5 variant for enabling i2c

* Don't reference timezone functions if MESHTASTIC_EXCLUDE_TZ is defined

* Use custom pow_of_two in RadioInterface instead of floating-point pow()

* First pass: enable sensors for STM32wL

* Fix AirQualityTelemetryModule being created if the PM25AQI header is missing

* Link in power sensor libraries

* more ini tweaks

* Add =1 to EXCLUDE defines, fix indentation.

* Drop HAS_WIRE in ini, it's defined in architecture.h

* Fix build when power sensor libraries are missing

Make MAX sensor integration into Power.cpp optional based on its library header existing.
Also make NullSensor expose a voltage and current sensor, because Power calls directly into these for INA sensors.
This lets us remove all the deps for the STM32WL platform.

* Change default I2C for RAK3172 to be I2C1, not I2C2

* Respect the laws of mathematics (oops)

src/gps/RTC.cpp

@@ -244,11 +244,15 @@ bool perhapsSetRTC(RTCQuality q, struct tm &t)
  */
 int32_t getTZOffset()
 {
+#if MESHTASTIC_EXCLUDE_TZ
+    return 0;
+#else
     time_t now = getTime(false);
     struct tm *gmt;
     gmt = gmtime(&now);
     gmt->tm_isdst = -1;
     return (int32_t)difftime(now, mktime(gmt));
+#endif
 }
 
 /**