Release 0.21.0

[igordejanovic]

Changed

• Transient state is cleared after parse to lower memory usage.
• Remove direct parser references from LRStackNode and GSSNode context objects,
  making them more self-contained and easier to reason about. See e51e5ffa.
• Update error_recovery signature to receive default_error_recovery as a
  parameter instead of accessing it via context.parser. See e51e5ffa.
• Store symbol class reference in symbol.cls for faster access. See e51e5ffa.

Full Changelog: 0.20.0...0.21.0

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This discussion was created from the release Release 0.21.0.