src/leveldb/build_detect_platform shows how upstream defines them.

These platform may not be able to fully build or run Bitcoin, but defining all
known to leveldb saves future hassle.

Now that all possible platforms are enumerated, specifying an unknown one is an
error.

GetBalance() can now take an ismine filter, which is passed down to
GetAvailableCredit. This allows GetBalance to be used to get watch-only
balances.

…t accounts.

…er file

Mark everything else static or in an anonymous namespace.

…n soon after

Pruning forces a chainstate flush, which can defeat the dbcache and harm performance significantly.

To avoid repeated implementations.

And document in the header.

Moves OutputType into its own module

Makes AddAndGetDestinationForScript use a generic CKeyStore rather than
the wallet, and makes it always add the script to the keystore, rather
than only adding related (redeem) scripts.