Release v0.5.0

This release brings a significant change to the block API and some structural changes regarding shared_ptr usage throughout.

Also, this should be the last release of newsched, as development is moving to the dev-4.0 branch of the gnuradio repository

Project-wide

• work() signature changed to pass reference to work_io type which wraps input and output structs
• port becomes a unique pointer owned by the block
• buffer becomes unique pointer owned by the port object (output port)

Blocks

• Tag strobe block
• Delay block propagate tags

Modtool

• Only process block directory if yml file exists

CI

• Ubuntu 22 worker
• Enforce clang formatting