Stardew Chest Buttons

Initial release.

Two Stardew Valley-style buttons on every chest, barrel, and shulker box:

- Add to Existing Stacks - for every item type the chest already holds, moves all your matching items in: tops up existing stacks first, then starts new stacks in empty slots. Item types the chest doesn't already contain are left alone.
- Organize - consolidates partial stacks and sorts the chest by item.

Works in singleplayer and multiplayer. All item movement is validated server-side (cheat-safe), so the mod is required on both the client and the server.