Returns a list of system resources of the type given as first
argument, or checks for its availability or its address, if
the last argument is 'A' or 'Address'. The resource list is
returned as a single string where the names of the resources
are separated by the string given as third argument, or
spaces if the third argument is missing.

The first argument specifies the type as follows:

'L' System libraries currently in RAM

'D' System devices currently in RAM

'M' Memory nodes registered

'P' Public ports

'R' Resources

'S' Public semaphores

'V' Volumes registered in the dos.library

'H' Handlers registered in the dos.library

'A' Assigns registered in the dos.library

'T' Tasks that are ready to run

'W' Tasks waiting for a signal

If the 'name' argument is given, then the function checks for
the presence of the given system resource and returns a boolean
indicator. If the last argument is 'A' or 'Address', its address
is returned as address string, or '0000 0000'x if the resource
has not been found.
If the separator is given, then the resources are separated it.