Various Title Screen Demo Enhancements

[someone2639]

Finally, a PR that nobody asked for!

Summary of changes:

• The Demo Input segment is no longer allocated if DISABLE_DEMO is defined (0x800 byte memory savings)
• Demos are disabled by default.
• Demo files are now in a new text-based camera-agnostic format. Vanilla demos have been converted to this format and are no longer broken.
• Demo files have been removed from assets.json
• Added a new file, demo_system.c and .h, and moved demo related functions and variables to that file (Currently 233 lines of stuff that doesn't need to be in a hack without demos).
• Added a new define, DEMO_RECORDING_MODE, which boots straight to START_LEVEL and prints the new demo format to the debug console.
• tools/demo_data_converter.py has been rewritten to detect demos in the assets folder, and the hardcoded assets/demo_data.json has been deleted.
• Added a failsafe to the function that sets the current demo, if ENABLE_DEMO_SYSTEM is defined but no demos are present.

[someone2639]

Ready to review! Still have to test on console to see if my DMA's are valid but I did manage to record some new demos

[someone2639]

HMC does not crash on console (even after letting it play twice) and all the new demos work too 👍

[someone2639]

This PR is ready for (re-)review. The Yaw/Mag based demo format has been dropped, but every button is now supported, so that developers can still record on their preferred camera system.

[arthurtilly]

what is the current status of vanilla demos in this PR

[someone2639]

deleted for good since db9a354, because this PR essentially makes them bloat.

[arthurtilly]

So no demos by default, I assume title screen will handle that correctly and just never attempt to start a demo? But will automatically start if one is made?

[someone2639]

Yes, the new system can handle zero demos (even if the preferred alternative for 0 demos is having them disabled, which removes all the code and the filetable from the final game entirely)

[arthurtilly]

Nice define change idiot