Shell tool should accept list of parameters

[hiker]

When calling a shell using -c, it needs the command and all parameters as a single string (sh -c "nf-config --fflags").

ATM, the shell tool does accept a list of parameters, but will not convert them all into a single string, instead they will be passed on as list, so in the example above it would be ['-c', '-nf-config', '--fflags' ), so --fflags would be a shell parameter, not a parameter to nf-config).

That's easy to work around in an application, but might result in unexpected behaviour.

Additionally, cwd and env could be useful as additional optional parameters.