Added a calculator bar seperate from search bar with a history of equations#1904

svind1er wants to merge 4 commits intoshedaniel:19.x-1.21.5shedaniel/RoughlyEnoughItems:19.x-1.21.5from

svind1er:19.x-1.21.5svind1er/RoughlyEnoughItems-Calculator:19.x-1.21.5Copy head branch name to clipboard