Nim0 compiler driver

Usage: nim0 action [options]* source [args]*

action    comp  Compile Nim0 source
          run   Excute source object file

options   -v    Show generated assembler after compilation or the current
                instruction being executed by the RISC emulator.

source          When compiling, Nim0 source code. Assume .nim0 extension.
                When execution, RISC object file. Assume .rsc extension

args            Command to be executed and parameters.