Feature request: customizable speedometer

[KillianMiles]

I would like to request some additional customizations to speedometer/showspeed feature and to suggest some "improvements"

1. Suggest calling the cvar "scr_speedometer" instead of "scr_showspeed" to make the functionality clearer from the name.
2. Need setting "2" to display absolute speed (x, y and z)
3. Need both X and Y offset cvars (could be one cvar with two args)
4. Need an "scr_speedometer_string" cvar - a string that displays directly left of the speedometer value - simply a place to provide a "legend" of sorts (e.g. "vel:")

one implementation could be to use 2 cvars: scr_speedometer (float type) scr_speedometer_options (float scale, float X, float Y, string legend_string) e.g. scr_speedometer 3 scr_speedometer_options 3 50 75 "vel:"

would display speedometer showing combined xyz velocity. Speedometer characters would have scale 3, located at x50/y75 location and have "vel:" printed in front of it