Prediction Model + Fixes #79

[doodlebunnyhops]

Refer to issue #79

Updated/Added

• [x] New "Use Prediction Model" button.
  • [x] Predict Extra Crops
  • [x] Predict number of crops by quality.
• [x] Apply crop quality to excess sold.
  • Assumes normal quality will be used first for seed or artisan consumption first.

Minor Bug Fixes

• [x] Wrong value of keg price shown, applied value was proper.
• [x] Tiller incorrectly applying if left checked when changing Farming Level below 5.

To Do

• [x] Keg and Jar prediction model not working
• [ ] Coffee Bean in keg/jar not calculating
• [ ] Validate NextYear in prediction model