Refactor DMC logic (#6294)

Refactors Death Mountain Crater logic to work in a more straightforward, if verbose, applies Tunicless navigation consistently, and paves over some small oversights.

As Child must be able to navigate DMC to some degree due to Child only checks, and logic should be consistent between Child and Adult, DMC no longer hard requires Tunic in any scenario. Instead checks and exits are split into regions, and each entrance has a "Fewer Tunic Requirements" heart count associated with it for each region which is then increased by 50% (rounding up) when FTR is off. This applies to both Child and Adult.

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