[Abilities] Add particle arguments

[cptflavio]

Right now, the speed, count, and offset arguments for particles are hardcoded, and it would be nice to have them as optional arguments in the ability JSON file.

[cptflavio]

looks like this will be added in
https://github.com/Wanderers-Of-The-Rift/wotr-mod/tree/ImplementsLegend/AttackOverrideTrigger

[ImplementsLegend]

Reopening since that PR is not merged yet.