Request: Allow subfolders for user components

Hi David,

I've got a small request: would it be terribly difficult to allow the usercomponent logic to allow for either custom folders or subfolders - this would mainly be a solution for organizing the usercomponents in a more orderly fashion.

I use myself quite some user components, also ladybug does this - and in order to be able to manage them a way to seperate them would be very convenient.

Regards

Arend