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There are now no more inline functions and a proper main function
instead of top-level code. Functionality-wise, nothing was changed. Code
was only rearranged and some comments added.

hot-fix for #75 but temporarliy breaks experiments that use Simics. We will fix
this in a later commit.

Starting with Python3.11, asyncio.wait() doesn't accept coroutines anymore. Instead, we have to wrap every coroutine in a tasks.

this flag was added added only recently which produces an error when used, for example, on Debian 12

Add new target `clean-external` to the Makefile, which triggers the
clean task of the respective buid system for each external simulator.
Each simulator can also be cleaned individually by using the targets
`{simulator name}-clean` (e.g. `gem5-clean`).

`make distclean` now actually removes the external simulators

- change example experiment to pyexps/simple_ping.py
- quickstart.rst: remove repeated information already found in README
- README: add note that simbricks-run is only available in docker containers

- add `Error Opening images/output-base/base.raw`
- move `Getting Help` to the beginning and add content