VRTK: Create "Dissapearing Flower" Box

[derwt]

Create box with lid for storing flowers.

• flowers sent to market on lid close (and other control(s)?)
• Could initially make it disappear other objects (like test cubes)

[jackthias]

TODO: More testing. There's a null reference error being caused at some point during the vanishing.

[jackthias]

TODO: A visual effect after a sale.

[derwt]

was this converted to a chute? @jackthias