Automatically serialized save data & game-provided tables that use it

[Meowlala]

Currently, save data is enough to do just about anything, but very barebones, and requires large amounts of boilerplate to achieve basic functionality. If the game provided a few automatically serialized tables for various conditions, the problem of managing save data could be averted almost entirely.

Such tables could include:

• Global save data that is never reset
• Run save data that is reset upon starting a new run, but kept through continues
• Level save data that is reset upon entering a new stage
• Room save data that is reset upon entering a new room
• Entity save data that is tied to individual persistent entities, like the player, pickups, and slot machines

Serialization should cover:

• Numbers, bools, strings, nil, and tables of various depths containing those values
• Vectors
• Colors (if this is possible given Colorize?)
• Error detection if a value is included that cannot be serialized

It could make sense to just use json for serialization like mods do currently, for ease of serializing basic values, with special handling for vectors and similar.

[Zamiell]

It's probably worth noting here that the IsaacScript save data manager now does everything now that is included in the OP (and more).