MD5 Builder: Rework for unqiue_ptr instead of malloc for internal dynamic buffers. #7208
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In order to guarantee exception-safety I used
unique_ptrtouint8_t[], withstd::nothrowdecorator.I cannot mark the functions as no-except because I don't know if the called functions (especially the Stream implementations) are no-except.
I also fixed the const-correctness of const member functions, such as toString() and getters.
I executed the host tests, I still need to run tests on the ESP8266, but this is the first time that I contribute with you, so I have to study how to setup and run your tests suite on my device.