Change the delta file format to diff only against the previous
generation, as opposed to all existing generations. This maintains
backwards compatibility for now, but adds to the DB only the minimum
amount of hashes so we can sync. Once all clients update to this new
delta format, it will no longer be needed to store all the hashes into
the DB.
Delete chia/simulator/simulator_constants.py
the keychain seems unneeded, it might be wrong given the 'new consensus' comment, and it prints a python literal not a hex string or somesuch. and it uses the `DEFAULT_ROOT_PATH` global i'm trying to get rid of. oh, plus it's a directly runnable file that ought to be available via some `chia` subcommand instead, if it sticks around.
- **streamable for merkle blob serialization**
- **wip**
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