Implement admin accessible remote log streaming in browser and via API
This is to be integrated into the simple admin and to be based on the log buffer tool developed as part of #2041.
- Log streaming is accessible from the /adm via a link
- When opened a progressively extending max n*1000 lines holding text view is shown.
- Streaming can be stopped and progressed
- The web site works in Lynx as well
- A rest API is exposed that
- ... allows to configure the log buffer for max 1000 lines and an expiration of max 100s
- ... to query the current number lines handled
- ... to fetch a page and extend expiration by a delay of max 100s