Change interface to process() for all NES mappers to make higher level scripts more flexible in using them, eliminate hardcoded prg,chr,ram sizes. Add CLI options to drive all this functionality directly. Note: Option letters are chosen somewhat arbitarily, next change will be to use argp so more descriptive flag names can be used ex: --nes_prg_rom_size_kb=16 in addition to single character shortnames. This will be important as console support expands.