feat: calculate resale values in Lifetime class

[zz-hh-aa]

What's new in this PR

In Lifetime.ts

• Added depreciatedHouseResaleValue, fairholdLandPurchaseResaleValue and houseAge properties for resale values (as these will be calculated over 'lifetimes' as well)
• Adds the above classes to the for loop to iterate through them too & push them to lifetime
• Tidied the file slightly
• Made calculateDepreciatedBuildPrice() method in Property public because we'll need to call it in Lifetime

Why

For story 4 in the calculator, we'll need resale values. Since they also need to be calculated over longer timespans eg lifetime, I thought it made sense to add them to the Lifetime class, as it had the most appropriate data structure.

I would like to merge #151 first so that I can use the helper functions to write tests for this class (that's why this is still a draft, no test file exists for Lifetime.ts yet).

Closes #153

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