simplify includes and libraries

[pliablepixels]

Ideally, to create a server implementation, a single header include and a single library include will be a very low barrier to entry for a 3rd party person wanting to get a quick start. He should be able to copy a lib and a header to his own dir and write a simple_example with just g++ example.cpp -lozoneserver -I. or something

[pliablepixels]

Let's do this after namespacing and cmake #5 #9