Tomb Many Graves 2

Added a compatibility fix for Inventory Pets' Grave Pet. If a fully fed Grave Pet is in the player's hotbar, their vanilla inventory will not be stored in a grave but kept on the player during death (as if TMG2 was not installed). If no such pet is in the hotbar, the graves function as normal. (Graves will still handle Baubles, Wearable Backpacks, and Cosmetic Armor until the Grave Pet is programmed to deal with those as well.)