New categories for svb28

Created by: zeffii

just thinking out loud here.

To make this more intuitive for new and current coders, we should make menu categories correspond with the file structure (without exceptions). Ideally it would be obvious which categories to use, but some nodes perform very unique tasks, while other nodes perform a great variety - this means it's not always clear in which category to put a node for maximum logical coherency.

Doing that in the Sverchok app structure is not trivial, but it will happen eventually - What i want to do is have a Lite Menu, which is a subset of the main Menu (maybe Shift + ]... ) , where a start can be made to re-categorize the nodes, and hide a few nodes