Add command context to custom commands

[Tschipp]

Summary Currently custom commands don't know what context they're executed in. It would be nice to get a list of all previous and future commands in the execution chain, for functions and anim controllers. Would also be nice if we had the ability to create files from a custom command

Alternatives/Considerations Compiler plugins can achieve this, but it's not very clean

Additional context/Motivation Would be nice to (hypothetically) make a /delay command