Add DO_PNR support for tools that support it #272
Description
Ex. IIUC Lattice Diamond supports timing info from post PNR, but is not configured to do in DIAMOND.py
See DO_PNR from VIVADO.py for ex.
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Ex. IIUC Lattice Diamond supports timing info from post PNR, but is not configured to do in DIAMOND.py
See DO_PNR from VIVADO.py for ex.