Lazy Finite or Infinite data in Widgets

[GTimothy]

A proposition to allow for lazy finite or infinite data in Widgets as a Wrapper that is indistinguishable from a Vec<Widget>.

I believe it would help with:

• Both Lazy Finite and Infinite Scrollable
• Both Lazy Finite and Infinite anything that uses a Vec<Widget>
• Lower computation cost in both cases: Lazyness => smaller widget lists in scope => simpler updates, fewer primitives calculated, simpler/quicker layout calculations.