Without flush we would might be loosing some bytes in writing.
This is explicitly stated in https://doc.rust-lang.org/std/fs/struct.File.html.

Also adds more explicit error handling in state related code.

Also adds flush operation after writing to file.

There's a new rust stable version.

Allows better understanding of the message.

More standard support for the `BusComponent` interface.

Allows blargg's test ROM to pass.

Made sure that OAM DMA takes 160 cycles to process.

This is a way of controlling the bytes that have already been written by the DMA controller.

Clarifies the boot state handling.

Improved some comments for DMA.

Added more pedantic validations preventing simple dummy data from being loaded.