misc: update PCL information (#899)

XiangShan is jointly released by ICT and PCL.

Add MulanPSL-2.0 License (#824)

In this commit, we add License for XiangShan project.

Coverage: scripts, add support for toggle coverage.

Added scripts to remove coverage statistics of print and assert.

1. filter out unnecessary coverage statistics
python3 scripts/coverage/coverage.py input.v output.v
2. re calculate the coverage stat

Added scripts to remove coverage statistics of print and assert.

1. filter out unnecessary coverage statistics
python3 scripts/coverage/coverage.py input.v output.v
2. re calculate the coverage statistics
python3 scripts/coverage/statistics.py output.v

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