Pass plugin instance to commandlet handlers.
Version => 2.0.0 (API breakage...)
View cleanup:
Added getPlayerContext() method, eliminates need for many overridden
methods in SMSGlobalScrollableView
Added scroll pos history stack in SMSScrollableView for better position
when entering/returning from submenus.
Made the BACK pseudo-item label & icon configurable.
Added back_item.label and back_item.material config settings.