Player inventory

[Matt-Crow]

Players can access their inventory to manage their items.

• [x] create and ItemTypeRepository which stores all ItemTypes and is sealed before the world starts
• [x] when a user first joins, send all ItemTypes in the repository. The client stores in a JS repository
• [x] InventoryTab class which stores all items of a given category (equipment, consumable, material, etc.)
• [x] finish implementing inventory, create player with a few test items
• [x] inventory component uses PlayerUpdateListener to update itself each time things happen to the user's player
• [x] on update, only send item type key, not the entire item type

[Matt-Crow]

Don't do an inventory grid, just do a filterable & sortable list

[Matt-Crow]

Probably just migrate all semi-stable game objects to dynamic ones, as I can optimize later if better performance is required, and I'll probably wind up sending full content to the clients instead of pushing updates.

[Matt-Crow]

This would be a good place to try out the new dialog HTML element