There are several noteable changes in this commit that mean that logging
will behave differently to how it did previously.
- There are now no separate filter levels for terminal and file output.
This is a feature that is lacking in `tracing` but is set to be resolved
by https://github.com/tokio-rs/tracing/pull/508. At which point we MAY
include it.
- The default log level was previously `WARN` - it is now `INFO`.
Persist the hotbar state to disk by writing it out to a `profile.ron`
situated next to the existing `settings.ron`. There are individual
profiles for every character on every server. On creation of a new
character the default hotbar state will be `[None; 10]` i.e. the hotbar
will be empty.
Resolves: https://gitlab.com/veloren/veloren/-/issues/577