Add tools to fill and dump memory #66
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This is quite hacky, so I'm a bit torn about keeping this on my repo.
It should definitely be enhanced if we keep it around so it doesn't look as dumb (using my name and 0x313373 as pattern; DSP layout being ugly too).
The main purpose of these tools is to test how long the Xbox RAM keeps the values intact after a shutdown / during a reboot. To our surprise, it seems to persist values just fine. I've personally tested around ~5 seconds manual shutdown / reboot and lost no memory. Someone else tested even longer periods and we still found matches.
I've then repeated the test with DSP memory which behaved in a similar way.
The inspiration for this was this paper. The motivation behind applying these techniques to Xbox is to transfer memory or DMA command blocks across a boot.