Vehicle UI: overall status indicator


![vehicleui_before](https://f.cloud.github.com/assets/3517115/1558472/cca9532e-4f92-11e3-8d6e-3a527e6a5fb9.png)

(Before)

![vehicleui_after2](https://f.cloud.github.com/assets/3517115/1558480/4b3aa4f4-4f93-11e3-8663-5fb1b69f141c.png)
![vehicleui_after1](https://f.cloud.github.com/assets/3517115/1558481/4b3b2afa-4f93-11e3-8313-e50267633b4c.png)

(After)

Moved the stats around some, and added functions to calculate the status of the vehicle and display it, colored.

The descriptors are like new (>=95%), dented(>=66%), battered(>=33%), wrecked(>=10%), totaled(>=0%). There is also error, which shouldn't come up. The colors are identical to the vehicle part damage colors (green, ltgreen, yellow, ltred, red).