no hotspot for foam

[nadegr]

in year 1 you can make foam using the two tubes

however you cant select the foam with the mouse, only with the keyboard.
also it doesn't appear when you press space.

[tobiaspfaff]

Ok, I forgot an hotspot there. Will fix.

[tobiaspfaff]

Fixed in git

[tobiaspfaff]

Fixed in 0.3