Changes to function keypad sequence and dynamic font and keypad size.
Rearranged trigonometric functions in the function pad.
Arc functions moved near normal trigonometric functions.
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Hard coding number of columns in function pad.
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Fixed minimum width and height.
The window can no longer have a width less than 20 units and height less than 30 (Default size).
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Dynamic font and keypad size
Screen, buttons, and button fonts now change with the change in window size.
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