* Use Monero-compatible additional TX keys
This still sends a fingerprinting flare up if you send to a subaddress which
needs to be fixed. Despite that, Monero no should no longer fail to scan TXs
from monero-serai regarding additional keys.
Previously it failed becuase we supplied one key as THE key, and n-1 as
additional. Monero expects n for additional.
This does correctly select when to use THE key versus when to use the additional
key when sending. That removes the ability for recipients to fingerprint
monero-serai by receiving to a standard address yet needing to use an additional
key.
* Add tokens_primitives
Moves OutInstruction from in-instructions.
Turns Destination into OutInstruction.
* Correct in-instructions DispatchClass
* Add initial tokens pallet
* Don't allow pallet addresses to equal identity
* Add support for InInstruction::transfer
Requires a cargo update due to modifications made to serai-dex/substrate.
Successfully mints a token to a SeraiAddress.
* Bind InInstructions to an amount
* Add a call filter to the runtime
Prevents worrying about calls to the assets pallet/generally tightens things
up.
* Restore Destination
It was meged into OutInstruction, yet it didn't make sense for OutInstruction
to contain a SeraiAddress.
Also deletes the excessively dated Scenarios doc.
* Split PublicKey/SeraiAddress
Lets us define a custom Display/ToString for SeraiAddress.
Also resolves an oddity where PublicKey would be encoded as String, not
[u8; 32].
* Test burning tokens/retrieving OutInstructions
Modularizes processor_coinUpdates into a shared testing utility.
* Misc lint
* Don't use PolkadotExtrinsicParams
