AsyncParticles 3.4.0-beta.1

Changed the default particle rendering mode to Synchronously to avoid rare and confusing ConcurrentModificationExceptions when used with certain mods.
- If you're still using an older version (≤ x.3.0), you may want to manually set it to Synchronously in the config screen.
- If you're a modpack author or want to test whether a different rendering mode (e.g., Fastest) provides a noticeable FPS boost in your modpack, you can manually select another enum value in the config screen(use with caution).
Added an option to specify which particle classes should be rendered synchronously.
Create v6.0.7 compatibility.