Cuphead - Some bug fixes

[mitchell-merry]

This patch fixes:

• The King Dice (Boss) split. (used wrong level completion flag) (major issue). This is the reason the xml includes Level ids now. The level ID updated after the scene which meant it was checking the previous level's completion flag, now it checks that the level ID is what is expected.
• King Dice for IL timing (needs to use some special cases)
• 0.01 on first loading screen (using some jank, might be an asl thing, I don't know)
• onSplit is no longer necessary since we use gameTime now (and was causing some unintended behavior previously as it wasn't using inILMode)
• pldm["levelObjects"] sometimes gave a "Sequence contains no matching element" error (don't know how to reproduce this consistently), so it was simply replaced with 0x10 which is it's offset in every version of Cuphead. link. It might be worth changing the .First in MonoClass[int] to .FirstOrDefault so that we can check for null and coalesce it to a default value if necessary.
• No save slots exists before the orange intro screen which produced a lot of errors, now it just returns a null pointer and returns false in update in this case.

Thank you

[just-ero]

And please make sure to test all of your changes once more.

[mitchell-merry]

That should be good - did end up finding another super minor bug with King Dice ILs that required me rebeat the whole fight for testing, which ended up taking a while