Rework Experience Calculation logic

[dphaldes]

Description

Changes the xp calculations to remove recursive calls and use much straightforward formulae

(Closes issues indirectly by removing all stack overflow recursions)
Closes #543
Closes #313

• My code follows the style guidelines of this project (.editorconfig, most IDEs will use this for you).
• I have performed a self-review of my own code.
• I have commented my code in areas it may be challenging to understand.
• I have made corresponding changes to the documentation.
• My changes are ready for review from a contributor.

[dphaldes]

I have also tried to clean function names, but it still requires some work. Let me know if you would like me to change docs/names

[dphaldes]

#363 will require an update if this PR is merged first (else the other way around)

[maxinglo]

If the fluid xp use int type can only contain about 4000 levels. maybe it's a problem?

[Rover656]

Maybe it is smart to switch to long in some places, similarly to #329

[dphaldes]

Overflows should not happen anymore, as we don't use recursions anymore. Switching to long may not fix anything as vanilla max level is an INT

[Rover656]

Stack overflows are avoided, yes however if we overflow an integer then we might find ourselves dealing with weird negatives

[dphaldes]

I will change the places where we store raw experience points into longs. The levels need to stay as an integer so that it is compatible with vanilla.

[Rover656]

This looks great, thanks a lot to both chonky and GotoFinal for working on this issue!