store state for any # of networks

[dan-da]

Addresses #163

Previously chain state was stored under a path such as:

~/.kindelia/state/{blocks,heaps}

With this change, the data is stored at:

~/.kindelia/state/<network_id>/{blocks,heaps}

This enables for example flipping back and forth between a testnet and mainnet just by changing network_id in the config, or even via cli arg.

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notes:

1. --network_id is now a kindelia node param rather than kindelia node start. This is because it also applies to node clean.
2. I have not yet implemented the suggested config changes. I will work on that next.

[developedby]

You probably wanted to merge this into dev and not into master

[dan-da]

@developedby yeah I just changed it to dev, thx.