Sim updates + rv64gcCacheSim.py fixed

Created by: jordancarlin

CacheSim Updates

• Update rv64gcCacheSim.py to work with wsim and allow any simulator to be selected (fixes #767 (closed))
• Update rv64gcCacheSim.py to automatically override the I_CACHE_ADDR_LOGGER and I_CACHE_ADDR_LOGGER parameters. This ended up leading to a lot of other changes to the simulation scripts, described below
• Update cacheSim scripts to return the number of mismatches

wsim Updates

• Add a new --param argument to wsim that takes an input in the form "param1=value1 param2=value2 ...". This is used to convert to the correct format for parameter overrides in each sim-specific script and is used at the compilation stage, unlike the --args plus args which are used at run time.
  • Switch to using this method for overriding the TEST parameter for testbench_fp

Questa Updates

• Use tcl list expansion to avoid the need for temporary variables and many small variables that always go together in wally.do
• Refactor argument parsing to work with both --args and --params

VCS Updates

• Add testbench_fp support to VCS (currently failing with mismatched signature)
• Update VCS script to allow for parameter overrides to be passed as arguments
  • VCS uses a different syntax for overriding parameters, so the value of --params is modified and written to a file that VCS reads

Verilator Updates

• Update Verilator Makefile to allow for parameter overrides to be passed as arguments