Adds support for client-side Thinkers, Actors, and ACS scripts (ACS uses the existing CLIENTSIDE keyword). These will tick regardless of the network state allowing for localized client handling and are put in their own separate lists so they can't be accidentally accessed by server code. They currently aren't serialized since this would have no meaning for other clients in the game that would get saved. Other logic like the menu, console, HUD, and particles have also been moved to client-side ticking to prevent them from becoming locked up by poor network conditions. Additionally, screenshotting and the automap are now handled immediately instead of having to wait for any game tick to run first, making them free of net lag.
Rewrote lobby to unify common and Doom-specific packet structure, allowing for saner handling of in-game joining. Added a new per-client stage system that allows individual clients to be handled at a time when gathering and sharing info. Reworked lobby UI to display user info and added kick/ban functionalities. Bans are only a temporary per-game IP ban (use passwords to keep unwanted users out). Increased max player count to 64 and unified engine constant.
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).
* split off the Doom specific lookup with short 8 character names into its own class and cleaned up the interface a bit.
* get rid of all short name aliasing 'optimization' - modern compilers are capable of optimizing memcmp and memcpy to use equally efficient code so none of these hacks are needed anymore.
* added reader for Descent 3's HOG2 format - yet another of these endless uncompressed formats with just a different directory structure...
