[SDK2013] [Feature Request] Move to 64-Bit and increase edict limit from 2048 to 8192

[dangreene0]

Increasing the edict limit would solve a lot of issues for many multiplayer mods using SDK2013 as a base. Increasing this limit and allowing for a 64bit branch would allow games to better utilize modern hardware.

Kind of a copy of ValveSoftware/Source-1-Games#5447 since it would benefit both games.