Upgrade all dependencies, eliminate duplicate heapless, eliminate unsafe from examples.
          #164
        
          
      
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embedded-io,rustls, and all RustCrypto crates are under heavy development, with many breaking changes even compared to their latest released versions. Hence, I didn't stop half-way, but went for the latest bleeding-edge prerelease versions of these crates. This PR should likely be merged once all dependencies are available as final versions.Anyway, I'd be happy if you could already have a look and give some early feedback.
CC @bugadani @lulf @newAM