Add color to fluids for pipe visualizer

[RedRafe]

• added colors to fluids
• fixed crash with buckets & invalid IDs

Regular view (w/ new colors inside pipes already)

Before

After

[RedRafe]

Ew, from my screen the different reds of mud/oxygen were more different, I guess they aren't that much then. Could go a different route but heh, it's all red/orange/yellow at the end of the day