[FEATURE] Arrange and Align helper methods

[g-mark]

Seems that a common task is for a bunch of child views to horizontally fill their parent, with possibly different insets. It would be interesting to explore this kind of convenience:

.arrangeViews(.fillX, view1 - 40, view2 - 40, view3 - 15, view4 - 32)

• options could be: centerX, fillX, leftAlign, rightAlign, plus same for vertical
• maybe have a param for an at: offset, like (.leftAlign, at: leftEdge + 20, ...)

Or, something like:

   align(.top/.left/.right/.bottom, views: Anchorable...)
   
   distribute(.horizontally/.vertically, views: Anchorable...)