[logging] move suspend functionality into the buffer to enable proper polymorphic usage of LogStream

testing with ctest also works

which is so much simpler than the autofools setup it's not even funny

remove superflous logX functions

- LogStreams are now ostream derived
- function names have been lower cased
- idea to base Logger on dune dbg streams has been discarded because they are not ostream based
- streams and logger split into two header