Swipe Calculator - gesture based interaction

Simple calculator with historical calculations, input operates using gestures, and result is calculated automatically.

Swipe on keypad:
- vertically or draw a plus symbol for addition,
- horizontally for subtraction,
- diagonally or draw a multiplication symbol for multiplication,
- diagonally / for division.

Swipe on screen:
- right on result to clear all,
- right on history to undo last.