Experiment: C++17 support (#9874)

* Add C++17 support

* Add C++17 runtime probes and update build configurations for STM32 and Portduino

* Remove unflags

* Update C++ standard flags across the platforms

* Convert a couple of instances to structured bindings

* NRF52 platform.txt to add C++17 support

* Still need the unflags apparently

* Remove C++17 runtime probe tests from test_main.cpp

* Reconfigured doesnt need a nodiscard

* Remove nodiscard attribute from init() method in RadioInterface

* Remove mbedtls/error.h from build flags

Removed include directive for mbedtls/error.h from build flags.

* Fix IRAM overflow

* Fix IRAM overflow

* Add build flag to exclude MQTT from rak11200

* Update C++ standard from gnu17 to gnu++17

variants/esp32/rak11200/platformio.ini

@@ -16,4 +16,8 @@ build_flags =
   ${esp32_base.build_flags}
   -D RAK_11200
   -I variants/esp32/rak11200
+  -DMESHTASTIC_EXCLUDE_WEBSERVER=1
+  -DMESHTASTIC_EXCLUDE_PAXCOUNTER=1
+  -DMESHTASTIC_EXCLUDE_RANGETEST=1
+  -DMESHTASTIC_EXCLUDE_MQTT=1
 upload_speed = 115200