[Enhancement] Menu item to pad or size all layers within selected scope
### Feature request / enhancement

1.0.5’s enable/disable automatic detection is interesting, but when it’s disabled, reapplying padding or spacing to my layers is cumbersome on large documents, as the new `Enter padding for selection` and `Spacing for selection` commands seemingly accept only one selection. Or maybe I’m wrong and it accepts multiple selections if their padding or spacing values are the same. Either way, a more efficient solution (for me, not for you, I’m sure) would be to let me select one or more artboards, layer groups, or layers, run a single command, and have Paddy find the applicable layers within that scope and do its thing. 

Or if its too much to go top-down, let me select a deeply nested layer or group and run a command and have Paddy do the equivalent of what it would have done if detection was on and I hit `ESC` over and over again. (How `ESC` worked in 1.0.2, if possible, which seemed to go back down on sibling groups; 1.0.5 doesn’t seem to do that any more.)

Thanks for listening.