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This prevents gem5 from erroring out after closing and re-opening VS Code.

Our VS Code devcontainer is based on our buildenv container, so we directly modify the latter.

We needed it to ensure that gem5's `PerfKvmCounter::attach()` would work but with simbricks/simbricks#109 this has become unnecessary.

This includes adding a requirements.txt for the Python packages required for linting. In the future, additional packages that our orchestration framework requires also go in here.

* dist/common/base: fix taking member of packed struct warning

* trace: removed outdated folder

* lib/simbricks/nicbm/multinic: fixed boost bind warning

* sims/net/pktgen/pktgen: removed forward_pkt and potential use

This removes automatically sorting the keys that I introduced in #97, which means that instead, attributes are serialized in the order they are defined in. With this change, simple information like start and end time are readable at a glance directly at the top of the JSON file.

This is based on our recent HackerNews Post and the description on our website.

allows callers to add a name suffix for each connection, so there are separate unix sockets.

this allows this to be called on all networks for mixed experiments.

So far NIC sims would directly modify the NetSim's list, not giving the
opportunity for subclasses to override. This istead adds a method for this.

Useful for running ns-3 only simulations.