Library "DegreeALine"
TODO: add library description here
Degree(x1, y1, x2, y2)
TODO: add function description here
Parameters:
x1: First X coordinate of a line, index of the bar where the line starts.
y1: First Y coordinate of a line, price on the price scale.
x2: Second X coordinate of a line, index of the bar where the line ends.
y2: Second Y coordinate of a line, price on the price scale.
Returns: Degree Of Line