Big improvements around large PGN file handling, viz:
- The loading process is about 100 times faster (really).
- The loading process no longer totally takes over the application.
- When over 100 games are present in the file, we no longer try to show them all at once.
This is such an improvement I'll call it 2.1.0. But there were big internal changes in the code to accomodate this, so I'll call it RC1. Please report any bugs, here or on the Leela Discord.