Improve math

[turbolent]

Description

• Replace FlowCreditMarketMath.one and zero with 1.0 and 0.0 literals
• Replace FlowCreditMarketMath.toUFix128 with call of UFix128 conversion function or literal
• Replace FlowCreditMarketMath.div with division operator, it already checks for division by zero
• Remove redundant code:
  • Static casts (e.g. 0.0 as UFix64)
  • Conversion function calls (e.g. UFix64(0.0))
  • Multiply with/divide by 1.0
  • Type annotations that can be inferred (e.g. let x: UFix64 = 0.0)

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For contributor use:

• Targeted PR against master branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the standards mentioned here.
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

[Kay-Zee]

Great! thanks @turbolent , we had done some similar work involving removing the unecessary div calls and constants in the FlowYieldVaults repo but had not gotten back around to doing it here, so this is amazing! And the includes further clean up beyond those as well. ✅