…4281

Settings were purposely imported via addon_folder_name.settings instead of sverchok.settings. I assume this was done to be able to write this: class SvPreferences: bl_idname = __package__. Because it seems that bl_idname of add-on settings should always be equal to name of add-on folder.

…unctions, refactoring

removing collecting sverchok node classes, it can be done by calling bpy.types.Node.bl_rna_get_subclass_py(bl_idname) instead,
move UI code from utils to the ui folder,
utils now are only registered when are imported from another core module or node.