In order for interrupt-based wake-ups (as introduced by #1142) to work concurrently with time.Sleep, we need to make some per-board changes.

Previously, sleepTicks (the function used as an interface between the scheduler and the hardware timer) was defined to block until the timer completed, since there was nothing else to do. Now we need to change this so that it bails out when an interrup

packBEAM should be also implemented in Erlang, so it can be integrated into existing Erlang and Elixir tooling in a easier way.

Following nanoframework/nf-interpreter#1564 need to add launch.json and cmake-variants.json to community targets.