Allow more restrictions for the Fallout Visualization

Description -

The Fallout visualization is more than just a pretty visualization, it also is my favorite way to create (complex) Sequential Segments. Next to the Flow viz, it is the most beginner-friendly way into more powerful segmentation techniques.

To make the visualization more powerful and the Segment creation easier, I prose to offer more options when editing a step:

Besides Eventual Path and Next Event/Hit, there are many more useful restrictions I can think of:

• Session based:
  • Within the same Session
  • In the next Session
  • In a next Session
  • After/Within X Sessions
• Time based:
  • In the same month/week/day/hour
  • On the next month/week/day/hour
  • After/Within X month/week/day/hour
• Dimension based:
  • On the same dimension item (like page)
  • On the next dimension item
  • After/Within X dimension items
• Event based:
  • After/Within X events
• Distinct dimension based:
  • After/Within the nth distinct dimension items