Gcc12 related fixes (#1138)

* GCC12 related fixes but still compiles on GCC9

* Suppress warnings about volatile +=

* Enable c++20 if supported by the compiler

On gcc12 we need to use -std=c++20 since constexpr .c_str() on std::string is only officially available since c++20 and the new gcc wouldnt let us use it with older standard

* code format

---------

Co-authored-by: Eisenberger Tamas <e.tamas@iwstudio.hu>

firmware/application/hw/max283x.hpp

@@ -22,6 +22,8 @@
 #ifndef __MAX283X_H__
 #define __MAX283X_H__
 
+#include <array>
+
 #include "rf_path.hpp"
 
 namespace max283x {