OONet Library clean-up-files

Those thing must be done before considering a well packaged library.
[OK] 1. Fix all #includes. For external we use <> for same we use "./blabla" by setting explicitly the file we want!
[OK] 2. Reduce all #includes to minimum.
[OK] 3. Change all handle types to typedefs
[OK] 4. Change liboonet subfolder to oonet, make oonet-tests to use ./ as main include, so that tests are using the same header structure as when they are deployed
[LOST] 5. Finalize gnu build to tools to use pkg config for dependancy on shared_ptr<> and registring liboonet as package too.
6. Finalize interface of netserver<> netserver_clienthandler, some things are still missing to consider it a robust design.
[OK] 7. Clear all #ifdef GUARD definitions OONET_smth_INCLUDED or OONET_HTTP_smth_INCLUDED
[50%]8. Add more tests for (ok)netstream_threaded, netserver, (ok)http::client, http::server