Storing all of the essential resources such as db, rpcs and logger in a
vspd struct enables vspd functions to be called without passing a bunch
of parameters unnecessarily. This will be increasingly useful later when
further changes are introduced.
The existing signal.go was inherited directly from dcrwallet, and was
slightly more flexible/complicated than required for vspd. This brings
the code more inline with the dcrd implementation which can be
instantiated in one line and with only one parameter.
Creating these closer to where they are needed tidies things up a bit,
and reduces the chance of them being used unnecessarily (as was being
done previously).
Only attach the dcrd notification listener after all other startup tasks
have been completed.
Attaching the listener before this can result in the notification
handler being invoked whilst startup tasks are still running, which
isn't necessarily a problem, but it is unnecessary and makes a mess of
logging.
Periodic database backups are no longer started automatically in database.Open(), and the backup written by database.Close() can now be disabled.
Only vspd itself requires backups, they are not useful for test code or future upcoming tools such as vote-validator.
* Update linter to 1.49.0
* Move vspd into cmd directory.
This is standard practise in Decred golang repos. Especially useful when multiple executables are built from a single repo.
* Ignore bins in new dir.
