New and improved nodes, much improved stability

In this release the underlying libraries are switched out for much improved stability. It now uses Daniel Freese's harmonyhub client and discover libraries.

The node types have been consolidated back to three nodes, the H command node now allows to select commands from both, activities and devices. This is a breaking change, as the H device command is being removed, therefore flows using this command will need to be adjusted, and the H command used instead.

The user interface of the nodes has been much improved, with auto-populating dropdowns, making the selection of activities, devices and commands more intuitive.