Hud Trails

# Description:
This feature was originally written by @Luomu and I've just tidied it up, added a menu configuration and tried to massage a small bug. There's a new string to be translated for use in the settings menu configuration.

# Notes:
Trails disappear, technically are reset, whenever the player changes between `Frames` and won't appear for other ships until they enter the same `Frame`. This prevents them being dragged off to infinity.

*Ready for review* I think - it is along the lines of the Speed Lines feature therefore I will set it to OFF by default. Enable it for testing from the configuration screen please.