Logical addition

Returns A OR B :

 A  |  B  |  A OR B
 ---+-----+-------
 0  |  0  |    0
 0  |  1  |    1
 1  |  0  |    1
 1  |  1  |    1

 Example :  or( 0b1101, 0b1011 ) -> 00001111

 Syntax : < x > | < y > | ou( x, y ) | or( x, y )