Restore DSim
This PR re-establishes Metrics DSim as one of the SV simulators supported by CORE-V-VERIF. Changes fall into one of the following categories:
- Fixes to Makefiles and associated scripts.
- Workarounds for specific DSim parser issues. These are clearly identified in comments (look for "Metrics DSim") and do not alter the function or the code.
- Increased the verbosity level for printing the testcase and environment configurations (from UVM_NONE to UVM_DEBUG).
Tested these changes with VCS, Questasim and DSim.