touchgfx::Circle::setPrecision() method

@fn void Circle::setPrecision(const int precision); Sets a precision of the Circle drawing function. Sets a precision of the Circle drawing function. The number given as precision is the number of degrees used as step counter when drawing smaller line fragments around the circumference of the circle, five being a sensible value. Higher values results in less nice circles but faster rendering. Large circles might need a precision smaller than five.