Refactor NetworkModule creation; support custom protocols/schemes

[Bisk1]

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  Implements Add option to use custom protocols and schemas #486
  Creating network modules is now split into protocol-specific classes
  Custom protocol-specific implementations can be added
  Removed dead code

[mscheibler]

My PullRequest Network module SPI is basically the same topic. It would allow to add custom protocols/schemes by implementing them as Java SPI and adding them to the classpath.
Maybe we could join our efforts

[Bisk1]

@mscheibler very well, I haven't seen your PR. Closing mine then.

[mscheibler]

I hope that mine PR gets merged in the foreseeable future. I updated it a few times already, but after the initial contect there was no resopse from the project owner. Maybe another voice could help.