OsZ Individual Needs Slider Mod

New look and new hotkey.

- Redesigned panel in black and gold to match the OneSimpleZoi brand, with the OneSimpleZoi logo.
- The mod now starts as a small round grey OneSimpleZoi button. Click it to open the panel, drag it to move it, and use the _ button to shrink the panel back to the button.
- Hotkey changed from F9 to F8 to show / hide the panel (F9 is now used by OSZ Height Slider).
- Removed the X close button.
- Need sliders now run from ice blue (frozen) to gold (normal speed).
- The panel is now a fixed size.
- No changes to how need decay or Refill Needs Now work.