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

src/mesh/TransmitHistory.cpp

@@ -141,12 +141,12 @@ bool TransmitHistory::saveToDisk()
         file.write((uint8_t *)&header, sizeof(header));
 
         uint8_t written = 0;
-        for (auto &pair : history) {
+        for (const auto &[key, epochSeconds] : history) {
             if (written >= MAX_ENTRIES)
                 break;
             Entry entry{};
-            entry.key = pair.first;
-            entry.epochSeconds = pair.second;
+            entry.key = key;
+            entry.epochSeconds = epochSeconds;
             file.write((uint8_t *)&entry, sizeof(entry));
             written++;
         }