Horizontal as well as vertical cleanup

[SimpleSi]

Editing large single scripts is one of the challenges with all block programming GUIs

This is going to be especially true for GP as I anticipate longer script blocks than Scratch

I've got many ideas to help with this (collapsing sections, icon-ifying scripts etc) but one that might me simple/easy/quick win is to have a horizontal cleanup action as well as vertical

It should work in the same manner as vertical - e.g instead of top most script going to top-left and rest below it, left most script goes to top-left and the rest off to the right.