Create: Portable Building Cannon

Additions

- Materials panel beside the configuration panel in Small Schematic mode: lists every required block with its quantity and the total available versus required.
- Material availability counted across all nested inventories: Shulker Boxes, Sophisticated Backpacks and any compatible container, in the cannon menu, the in-game list and the placement preview.
- The cannon consumes materials directly from nested inventories during placement, without moving them into the player inventory.
- Scrollable material list with mouse wheel and a draggable scrollbar.
- Toggle to show only the missing materials.
- Inserting a Building Package or a Schematic auto-selects the matching mode (Relocation or Small Schematic).
- Optional JEI and EMI support: the materials panel stays clear of their overlays and the R / U / A keys work on its items.