Rolling window boolean (onset / termination)

[Peder2911]

A "rolling window boolean" is a convolution of a 2-d vector, combined with a boolean operation.
This transform allows us to expose "onset" and "termination" transformations, where each value is the product of either the preceding or the following value:

0,0,1,1,1,0,0

results in

0,0,1,0,0,0,0

or

0,0,0,0,0,1,0

The crafty user would maybe "implement" this themselves by combining conditional and delta transforms (change in gt_0/lt_1)

[Peder2911]

This is added via a port from ViEWS 2 I think. Demonstration remains.