(MouseArea) Button Event Handler
There is a bug in the mouesarea control that causes problems when multiple mouse buttons are pressed at the same time, because sometimes the mouse release value of 0 is not sent.
I created this macro to intercept button pushes from the mousearea control, to force only one button to be active at a time and to send a value of 0 from every mouse button when any one button is released. This is all in an effort to make the mousearea control more predictable in behavior.
Lets hope future versions of Reaktor do not have this mousearea bug, so that we can go back to using multiple mouse buttons simultaneously.