* add a little Stash utility.
* add radio state RAII helper.
* first part of radio_state changes
* add radio_state_ to rest of apps
* fix freq_step and format
* fix unused ui_sigfrx: corrected sample rate, added back freq setting
* 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
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Co-authored-by: Eisenberger Tamas <e.tamas@iwstudio.hu>
Modified TPMS app to allow switching between Celsius & Fahrenheit temperatures, which also simplified some of the code by sticking with a constant heading row
* Added HamItUp option to allow quick offset of the tuned frequency
* New HamItUp icon for top bar
* HamItUp checkbox status and frequency persistent settings in Settings/Radio
I choose what I think are the best Titles based on existing titles/class names and so on. There were also inconsistencies between TX and Transmit and RX and receive. I renamed them to shorter version TX and RX also added it as suffix where possible to make it clearer in what mode you are in. If you have any other title suggestions or changes please use Add comment on Files Changed Screen so I can change it.
