Rewrote netcode to be more stable and functional. Packet-server mode has been restrategized and will now be the default netmode when playing with 3+ non-LAN players. TryRunTics has been cleaned up with older tick control behavior removed to account for the rewritten renderer. The main thread is now more consistent when playing online to prevent potential slow downs and lock ups. Load barriers are better accounted for to prevent spikes on level transition. Improvements to chat and lobby systems including a force start game button. Added a suite of new host options such as kicking and controlling who can pause the game. Max players increased from 8 to 16 since the new code can now handle it.
Note: Demo functionality is untested. This will be rewritten at a later time alongside improvements to GZDoom's playback features (e.g. freecam mode).
Use TObjPtr to improve null checking. Add option to clear only specific kinds of Behaviors. Fixed removal checks while ticking. Don't stop at now-null behaviors when iterating.
Imported Behaviors to the engine to allow them to properly clean up their level list. Restrict Behaviors from being new'd in ZScript as they need an owner to function.
Allows for arbitrary behaviors to be attached to Actors in a way that doesn't require the use of Inventory tokens. This list can't be freely modified nor can it have duplicates meaning it has far better deterministic behavior than using Inventory items for this purpose.
