`ItemPotion`: clear stew effects, modernize (#2582)
* Initial update + cleanup
* Remove another redundant method
* Move legacy code to the bottom
* Properly clear suspicious stew effects
* Fix `getMapTagData` maps order
* Mirror upstream changes
* Early return in `setPropertyValue`
* Update meta
* Color under `includeExtras`
* Correct direct `object` usage
* Cleanup `getMapTagData` list creation
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commit: 5cf15d9)
