Replace vanilla recipes, and inventory icons

• New: replaces: on a recipe takes a vanilla recipe off the server while yours is loaded, so replaces: minecraft:stick swaps the stick recipe for your own. Delete your recipe and reload, and the vanilla one comes back. See Replacing a vanilla recipe.
• New: gui: gives an item its own look in inventory slots, a model or a flat {texture: ...} icon, so a vehicle or a big prop no longer shrinks into a smudge in the hotbar. See An icon in the inventory.
• Fixed: clicking the vehicle you are already riding no longer tells you every seat is taken.

0.2.46: Sorted Studio dialogs

• New: Studio dialogs can sort a box's pieces for each player, by values each piece carries (a shop's items by rarity, then by price, the ones a player can't buy yet last), in an order a button in the dialog picks, and show a page of them at a time. See Sorting a box's pieces.
• Fixed: a plugin pushing a vehicle upward (applyImpulse with an upward part) did nothing while the vehicle was on the ground, so jump pads and ramp kickers in addons never launched anything. The vehicle now leaves the ground with that speed and falls back under gravity.