add a fuel gauge to pod UI

[Waffleloffle]

while I like the pod fuel change, not being able to see how far your pod is from shutting down entirely is a major detractor towards using pods for anything now. with the variable amount of fuel used by various pod settings and equipment running at the same time, it makes it almost impossible to mentally calculate what your tank's looking like, especially when you have to do more than go from a point A to a point B. I think having that visual referencw present when you're in the pod would help people not feel too nervous to use pods entirely

there is precedence for this in certain features in real life, such as, "car"