GUI does not represent accurately represent wallets with multiple accounts

[goatpig]

1. New wallet format allows for multiple account per wallet. Most common use case is BIP44/48/84 accounts for one given seed.
2. Address types per account is not signified in a meaningful way in wallet properties UI. This goes not only for multi account wallets, but also legacy, single account wallets with multiple address types on the chain (P2PKH, P2SH-P2PK, P2SH-P2WPKH).
3. The key export GUI needs improved to reflect the range of address types and multiple accounts.