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This PR introduces support for POSIX shell plugins.
For this, it creates a subprocess containing a shell.
The functions are called by entering them via stdin in the interactive shell.
In order to detect the end of the process, a random end marker is written to stdout that marks the end of stdout of the function.
The entire stdout of the function is interpreted as its result. If the function exits with an exit code not equal to zero, a
CallErroris returned instead of stdout.Resolves #18