- Add artist/circle name convenience function
- Add wavePath search functionality

Squashed commit of the following:

commit 5e2700e3
Author: Daniel Sonck <daniel@sonck.nl>
Date:   Fri Nov 16 13:15:21 2018 +0100

    Make DB library installable

commit 8ca1def5
Merge: 980e63e8 6f7a8133
Author: Daniel Sonck <daniel@sonck.nl>
Date:   Fri Nov 16 01:25:44 2018 +0100

    Merge remote-tracking branch 'origin/feature/indexing' into feature/installable

commit 980e63e8
Author: Daniel Sonck <daniel@sonck.nl>
Date:   Fri Nov 16 01:03:44 2018 +0100

    Make DB a static library

commit 6f7a8133
Author: Daniel Sonck <daniel@sonck.nl>
Date:   Thu Nov 15 15:26:54 2018 +0100

    Improve DB

Squashed commit of the following:

commit 6f7a8133
Author: Daniel Sonck <daniel@sonck.nl>
Date:   Thu Nov 15 15:26:54 2018 +0100

    Improve DB

- Refactored most to ModelManager and ModelManagerImpl
- Added RandomSong pseudo traits
- Fixed QueryBuilder to not modify itself during prepare

- Added spdlog
- Removed glog
- Fixed playlist
  - Now forwards next directly if player is starved
  - Sends WANT when playlist is starved before connection
  - Forwards SKIP
- Formatted all files

- Implemented TCP control protocol
- Added configuration files
- Added clone of old database access system
- Various other things