Fix Tabs

Spaces to tabs
Add is_group function

Check if layer is a group
Define groupLayers inside function, fix whitespace

groupLayers was created outside of this function, making it non reusable
Add CSS shorthand paddings

Support for 20:10, 5:10:20 or just 20 like in CSS
Check if layer is not a group & whitespace

Check if layer is not a group, and indent corresponding items.
Set background immediately if name is set correctly

If name is already formatted as padding values, make the background
with the right offset immediately.