- Upgraded "[_Select2_](https://select2.org/)" js lib `v4.0.6-rc.1` → `v4.0.13`
- Fixed some issues where changed map settings (e.g. "share") do not get updated/stored, closed#889, closed#925
- Moved ajax endpoints for map create/update/delete into `/Api/Rest/` dir
- Minor UI improvements for "manual dialog" (fixed pixelated text)
- NEW "plugin API" for custom UI modules, closed#913
- NEW live "Killstream" for killboard module, closed#909
- NEW "custom layout" UI settings, closed#470
- BC Break: Project folder structure changed. Removed `app/main` dir.
- BC Break: Core _PHP_ framework + dependencies moved into `composer.json` and are no longer part of this repo