[REFACTOR] calculateSpellslots() in core.js

[KingFruit85]

Review to see if this can be simplified/refactored as currently quite a beasty function

[HedgehogHolly]

Is this one you could give me guidance on? 🤔

[KingFruit85]

@HedgehogHolly So this one is looking at if the function could be written more efficiently, I haven't had a chance to look at it properly but i think it's just a big if/elseif loop.

I think i was considering breaking it into smaller functions that focused on one class each, for example

calculateBardSpellSlots()

If we did that, then calculateSpellslots() could just be a switch case that calls the sub functions, does that make sense?

It's more of a readability change if anything.