Adds clean parachain runtime

[vayesy]

Previous PR & discussion: #90

What's done:

1. Created separate runtime for live (clean) version of the chain.
2. Cross-chain transfers enabled.
3. Added uniques pallet to both parachain runtimes.
4. Updated local-relay setup with actual runtime code.
5. Finalized node names as following:
   1. zero - live parachain node, which will be used to run on Polkadot. It does not contain GameDAO/Zero pallets.
   2. subzero - dev parachain node, used to run dev/test/stage environments. Contains all pallets.
   3. subzero-standalone - dev standalone node. May be used for local development/testing. Contains all pallets.

Discussed questions:

• Implement feature flags to build appropriate node/runtime (as separate task)
• Add rmrk pallet to dev runtime add rmrk2 pallets to parachain #119, once tested also add it to clean (live) runtime

[vovacha]

Finally, this naming makes sense!
0️⃣ 🚀

[2075]

lgtm

[2075]

would make sense to have the two address spaces reflected here, afair 23 and 24? 23 subzero 24 zero?

[vayesy]

@2075 we can do that in chain spec file if needed. This might be good idea to differentiate but can also cause some issues (at the beginning) due to address format mismatch.