Enhancements + Unit Tests for Pin-Placement Odb Steps

[donn]

• Toolbox objects no longer create a folder immediately upon construction
• The Classic flow has been reordered so ApplyDEFTemplate takes precedence over the CustomIOPlacement, which while it makes less sense in some aspects, matches OpenLane 1
• KLayout.OpenGUI:
  • Added a new boolean config var, KLAYOUT_EDITOR_MODE to that enables editor mode in KLayout
• Odb.ApplyDEFTemplate:
• Added FP_TEMPLATE_MATCH_MODE, with values strict (default) or permissive: with strict raising an error if any pins are missing from either the template or the design.
• Odb.CustomIOPlacement:
  • Completely re-implemented pin placement file parser in Antlr4 for more thorough syntax and semantic checking at https://github.com/efabless/ioplace_parser
  • Formalized concept of annotations; documented three annotations: @min_distance, @bit_major, and @bus_major.
  • Rewrote openlane/scripts/odbpy/io_place.py to rely on the new parser + general cleanup
  • Updated documentation
• Fixed bug where VERBOSE logging in internal plain output mode simply used print

Testing

• Added step tests for
  • Odb.AddPDNObstructions
  • Odb.ApplyDEFTemplate
  • Odb.CustomIOPlacement
  • Odb.ManualMacroPlacement
  • Odb.RemovePDNObstructions

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Depends on efabless/openlane2-step-unit-tests#11
Depends on efabless/openlane2-ci-designs#12