various speedups for the app / applying settings - allow for remote beast source when SDR is configured as other or 978

[wiedehopf]

• some more echo timestamps for docker-compose-adsb
• release notes
• speed up startup by limiting proxy_routes to those that are needed
• make dns update asynchronous, good enough when the user reloads to alert to DNS not working, don't delay page render for DNS when it's fine in 99% of cases
• docker-compose-adsb: remove rb hack setup script call, now handled in python
• docker-compose-adsb: speed up user env injection
• offer remote sdr option if no 1090 SDR is configured, not only when no SDRs are present

[wiedehopf]

Hold the merge! :)

Need to fix something.