las3_pub / predictable_parallel_patterns

We do this as we can not read them properly online as a artifact without downloading.

The local storage per thread is only a pointer, this must be assigned AFTER the local storage object has moved to it's final location (e.g. on the stack of the caller). We might even change this a little further in the future to make the location of the state object more transparent.

The first draft of the internal threading component is currently only implemented using the c++11 std::thread, pthread support will be added next.

For now this is only running our catch tests, but we plan on adding more (ThreadSanitizer, basic performance metrics) later on.

Seperate library from other parts of project (samples, playground, testing, ...). We still are in one 'toplevel' cmake project, so we can for exmaple compile everything (library and playground) in debug mode, for simple development.