Improved "type" filter: multiple types are now supported, and fixed character race search on dnd5e

[IrmatDen]

Hi,

I took the liberty to implement multiple types support. While testing it, I discovered that the race of a dnd5e PC generates nested arrays due to additional [] wrapping a split call. Given that other discovery methods generates one dimensional arrays, it seemed like a simple typo. Feel free to reject and I'll remove this "fix", and adjust the multi-type support accordingly.

Thanks

Edit: additionally the sw5e character's race was not generating an array. But it's an untested change, and maybe sw5e generates arrays natively; let me know if I need to revert the sw5e change.