[BUG] Can only apply one effect per type to charms

[UnknownSilicon]

Describe the bug
It is not possible to apply more than one effect of the same type to a charm.

To Reproduce
Steps to reproduce the behavior:

1. Create a charm config with two instances of a PLAYER_PARTICLE effect
2. Apply charm to item
3. Observe that only one effect is present

Expected behavior
Both effects are present

Additional context
I have no idea why I designed it like this. Basically, it should likely be an ArrayList instead of a HashMap for storing effects, but that might need to be different too.