[feature] use 'thiserror' for the existing errors #797
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Using
thiserror(already in our dependencies) to improve the definition of 2 existing errors (RgbErrorandTimeError). Note that they both were implementingdescription()which is a deprecated function of the traitstd::error::Error. The modification is not strictly equivalent to what was existing before (because there is now no difference between theDisplayimplementation and the associated error message). But I believe this is fine sincedescription()should be implemented intoDisplay.