Finished refactoring spells.cpp, modifying other files only as needed.
Some functions are 99% binary exact now, like PlacePlayer, for example.
Added notes/TODOs for places with remaining discrepancies.
* Rewrote GetManaAmount to result in the same decompiled code as the original function.
Fixed the type of `PlayerStruct->pClass`. Thank you @galaxyhaxz for all the help getting into it :)
* Renamed everything back to their original names
