Add new concmination level

[ghost]

The theme is inside a fridge. The level will be called Ivan's Icebox

• [x] Design
• [x] Art
• [ ] Sound
• [x] Wired in + game mode functionality
• [x] Playtested, ensure network is functional.

[ghost]

Artwork is done, just needs game mode functionality, audio, and to be wired in.

[madvlad]

I'll add a temporary spawn to the margarine box. Where will the beacons be?

[madvlad]

• Level is wired in and playable
• @GeraldJerome are you still up for making little tracks / sfx for this level?
• We can playtest this tonight if youre up for it, @ParadiddlePete ?