Add a real-time OSD for showing entity properties

[Outerbeast]

Basically the same thing as was done here: https://gamebanana.com/mods/39429

Goal is to monitor entities much easier than spamming .ent_dumpinfo in console and then squinting at the printout for 10 hours to get the desired info. Entity in crosshair gets highlighted and info is shown in the osd, the most relevant entvars printed on screen
Some extended things for the player info like for instance view offset, velocity, etc would be convenient as well.
Command could be .ent_showinfo(? If its not used already for something else)