Merge pull request #425 from Frederikam/release/v2.0

Some things happening between 1.0 and 2.0 in no particular order or sorting and without any claim of completeness:

Lavalink support
Fresh builds from our build server
Caching of searches
Dropping SQLite in favor of embracing PostgreSQL
Docker
Sentry
Metrics
Context pattern
Voteskip
Basic weather api
Basic Math
Ramp up of selfhosting and contributing docs
Multiselect
Merge of language submodule
History
Custom and mention prefixes
Eventlogger
Gradle

https://github.com/Frederikam/FredBoat/pull/425

Download: https://ci.fredboat.com/viewLog.html?buildId=2456&buildTypeId=FredBoat_Build&tab=artifacts&guest=1