las3_pub / predictable_parallel_patterns

Right now no work can be spawned, we simply have a proove of concept that we start up each thread, work for the master to finish and then synchronize back to the main thread.

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

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.