Rework the loan system

[MRVDH]

Collected comments

• "Make my loans pay off over time" (cowmandude).
• "Let me adjust that timing for a longer interest rate" (cowmandude).
• "Give me a credit rating. As I get more in debt push up my interest rate" (cowmandude).
• "I wish my interest went down as I paid my loan" (Pyrite19).
• "Bank gives you unlimited money, just keep taking billions/trillions, invest them into buying the biggest properties(to reduce lag), level up, take more loans, rinse and repeat." (efethu)
• "The pay off slider should probably default to 100%" (Houdiniman111)
• "The ability to setup automatic deposits/pay offs on your loans." (Houdiniman111)
• "Variable interest rate, loan terms, etc. Loans are very basic, unlike actual loans, at the moment" (Houdiniman111)
• "Interest actually based on balance rather than total" (Houdiniman111)
• An option to enable "safe loan limit" mode, which sets your loan limit such that your interest amount wouldn't exceed your net profits. (James103)

Proposed rework

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[Billy987bob]

Loan amounts by Default should be 5k with +1k per level + more according to credit rating.