Refactor text color variable names, export 2 color values to Lua

Use light gray color for volume change, just like for the auto camera msgs The idea is that these are "local" messages for local changes

Use full string for sidFuel and avoid string concatenation Fuel as in fuel for saucer, landgun, flamethrower, icegun. Old string was built with like this: sidFuel + ": " + fuel + "%". New string us built with proper format string instead