SIMPLE Vehicles

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Wow what's this, A Pull request from Freestation's Headcoder? Yeah I thought I'd start doing them so you can actually deny something I create, I can deny your stuff, so why can't you deny mine? Also allows me to notice things like the Donkey.dm commit in this PR for example.
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Adds Bicycles to the code
Adds Support for *SIMPLE* vehicles
Adds a Space vehicle (Pod) that is incomplete, you will suffocate if you use it
Adds some T-Junction sprites for Catwalks