Add game system support and resource precaching #144
Merged
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Game systems have a ton of useful callbacks at different stages of the game loop, such as before or after entities run their think functions, among many others.
One such callback is
BuildGameSessionManifest
which is called when a map is loading and it gets a resource manifest, to which resources like models can be added (or "precached") for use in game.Right now the game system is solely used for precaching resources, but it can later be expanded to implement various callbacks depending on our needs.
This supersedes #123.