- fixed a bug where "multi character location tracking" is not working on different browser tabs, #446
- fixed a "map sync" bug with 2 open browser tabs with the same character active
- improved file structure for _Model_ classes (`app/main/model/..`). Group by database name
- improved database connection handling (fixed persistent DB connections)
- improved "signature table" added "loading" spinner if table gets updated or data is processed
- improved ajax endpoints for "signatures". Moved into new REST API
- improved ajax endpoints for "structures". Moved into new REST API
- upgraded DB "Cortex", PHP lib `v1.6.0-dev` → `v1.6.0`
- upgraded DB "Schema", PHP lib `v2.2.2` → `v2.2.3`
- upgraded some 3rd party NodeJs packaged (or development) in `package.json`
- added status information for "WebSocket" installations to `/setup` page (e.g. active connections, startup time)
- removed "ext-zmq" as required PHP extension
- removed "react/zmq" as required Composer package
- removed "websoftwares/monolog-zmq-handler" as required Composer package
