Allow setting a seed for random numbers - #399
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…and Zephyr conflict Ideally we should not have to do this and it increases the size of the binary slightly but there is no way to avoid the conflict between ESP-IDF and Zephyr otherwise. However, rand and srand do work fine on other boards. Why rand/srand: The entropy API appears to be more useful for cryptographic purposes by using hardware entropy which we don't really need for basic random numbers. We still have some conf options for this but this is mostly becaues the networking stack can also sometimes use entropy. By using rand we can also use srand to set the seed which the entropy API does not support.
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Adds
random_set_seedto set the seed used byrandom_int.Currently we use
std::minstd_randon Zephyr, this due to a linker conflict between therandomfunctions defined by both Zephyr and ESP-IDF.