* use sequential loading for all UI resources
- load common.js and style.css sequentially for all config pages
- restrict all requrests in index.js to single connection
- retry more than once if requests fail
- incremental timeouts to make them faster and still more robust
- bugfix in connectWs()
- on page load, presets are loaded from localStorage if controller was not rebooted
- remove hiding of segment freeze button when not collapsed
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