lastfm: limits to user data output

Define configuration keys for maximum and default number of user data
items output, with a separate value for shouts (which are usually much
more verbose and therefore would have a much lower maximum and default).

Each command also allow the specification of the number of entries
actually output (different than the default, clipped at the configured
maximum.

This way user data has the same rate limiting as events.

Internally, the switches for the user data are also made more uniform to
select, where it makes sense, different sentences depending on how many
entries are being displayed (none, all, some).

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