Inventory management

[kpreid]

To have a usable inventory we need:

• An inventory size bigger than just the “hotbar” itself.
• UI state where said entire inventory is visible.
• Interactions to rearrange, re-stack, and discard inventory items.
  • UI, rendering, and input-handling support for drag-and-drop type gestures.
    • Click-and-drag inputs (as opposed to only instantaneous response to mousedowns)
    • Non-critical: Grabbed item rendered floating above the UI off-grid
  • Non-critical: support for items dropped in the world (Implement physics bodies known to Spaces #301).
• For editing, a way to bootstrap into having various editing tools without necessarily having to keep the whole set in inventory. (I have been thinking that there should be a “free editing toolbox” that you can copy items out of, but that is even more mechanisms needed.)