Add a way to load a script from console (script_reload_code)

[girlglock]

Similar to source 1 squirrel and source 2 lua vscript, running script_reload_code scripts/myscript.vjs would execute the script without having to set up a point_script ent via ent_create.

This is very useful for server hosting on official maps, playing with friends in private lobbies or making practice scripts.

creating a point_script entity via ent_create that points to our script works but is not good enough since the entity is not persistent and will be gone on new round