Added skcb (skclipboard) functions load, rotate, and paste

This adds a persistant WE LocalSession to the class so that various operations can occur between functions, and a custom LocalPlayer to provide compatibility with loggers like LogBlock and Prism (tested with Prism, based on https://github.com/LogBlock/LogBlock/blob/master/src/main/java/de/diddiz/worldedit/LogBlockEditSession.java#L42-76 it should work with LogBlock).