+ Added setting to disable auto save messages
+ Added default filler item for every gui (not individually as of yet)
+ Added "smart" min / buy now price calculation.
This is disabled by default, if enabled, say the player sells a stack of 32 diamonds for $100, it will adjust the min / buy now price to 3200 (32 * 100), if the user does wish to sell the entire stack for $100 they can provide the command flag -s or -stack.