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.
Not only did we already have multiple booleans in it, yet it theoretically
could expand in the future. Not only is this more explicit, it actually cleans
some existing code.
A type alias of MoneroAddress is provided to abstract away the generic.
To keep the rest of the library sane, MoneroAddress is used everywhere.
If someone wants to use this library with another coin, they *should* be
able to parse a custom address and then recreate it as a Monero address.
While that's annoying to them, better them than any person using this
lib for Monero.
Closes#152.