v0.2.0

Lots of views:
- Query view (`system.processes`)
- Slow query log (`system.query_log`)
- Last queries (`system.query_log`)
- Processors (`system.processors_profile_log`)
- Views (`system.query_views_log`)
- Merges view (`system.merges`)
- Mutations view (`system.mutations`)
- Replicas (`system.replicas`)
- Replication queue view (`system.replication_queue`)
- Fetches (`system.replicated_fetches`)
- Backups (`system.backups`)
- Errors (`system.errors`)

UI rework, I don't even remember what was in the v0.01 version (BTW the
tag was wrong), at first I used menubar, but it does not allow to use
shortcuts correctly, so I've switched to select from the left (like in
csysdig) + header with all possible global shortcuts.

Plus now shortcuts are generated automatically from one place, instead
of being duplicated 3 times before.