trurl: support ?= for set, to only do it if not already set #298
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Idea-by: @emanuele6 in #296
Due to missing support in the libcurl URL API, this is not really working for the scheme component right now, as that will always be considered set once a URL has been parsed. The scheme guessing the parser does sets it internally and there is currently no way provided by the API to figure that out.