v8.1

Update Notes:

1. Enhanced the verse replay file analysis feature, now supporting batch analysis.
2. Fixed potential calculation errors in the free12w-4k and larger tables.
3. Modified some default settings.
4. Added support for dark mode and custom color themes.
5. When calculating endgame tables, information such as the number of positions, speed, and time used is now logged to a table.
6. Fixed several minor bugs.