[Feature Request] Add cvar to control style of dlights

[Huitzilopochtliofpain]

Ironwail fixed a quirk of dlights where they changed size depending on texture scale, and they also had a star shape instead of being circular. These quirks could be purposefully used by maps to create certain effects, it would be useful to have the option to reenable them with a cvar, giving both the option to go back to star shaped dlights, as well as the option to make their size depend on the texture scale of the surface, like they were in old engines, so that maps that use these effects can ask the player to change this option.