pothos-library: move port objects into Block private, inline getters
pothos-library: replace port info with a vector of names in creation order
pothos-library: assign buffer manager callback in activate
pothos: use async futures to speed up module load
pothos-library: moved inline definitions into blockimpl
pothos-library: create a default thread pool for configuration
Merge branch 'master' into port_work2
pothos-library: moved auto port allocation to port allocation cpp
pothos-library: made pothos library Builtin for the library