Added the following:
optional functionality to access player shopkeeper's chest inventory though him (helpful when chest is hidden)
option to disable renaming button
option for delete item data (for using spawn egg as delete item)
can set more descriptive button tooltips (using lore)
option functionality to kill shopkeepers if their chest is broken
optional functionality to test chest access through other mods before using it for a shopkeeper (not tested with chestshops)

There aren't enough buttons to allow both renaming AND inventory passthrough