refactor: add possibility to support different URI schemes #69
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Dealing with the addition of DTLS to the library, I noticed that the current structure of the library does not really allow for differentiating between URI schemes. This PR proposes a new structure that allows for adding additional network and channel types that can be chosen based on the URI scheme that is encountered.
This way, in contrast to what is currently proposed in #35, additional ways of transporting CoAP packets can be defined in their own classes and do not need to be integrated into the UDP channel/network classes. This also makes the library easier to extend with features like CoAP over TCP or CoAP over WebSockets.
Unfortunately, this PR requires #35 to be rebased/adjusted (sorry @Sorunome) but I hope it won't be too much work :/