[ipcamera] Fix null URL channels and fix multiple cameras use the same ffmpeg output...

[ipcamera] Fix null URL channels and fix multiple cameras use the same ffmpeg output folder. (#10846)

* Fix urls are null until binding restarts.

Signed-off-by: Matthew Skinner <matt@pcmus.com>
* Change to using port config.

Signed-off-by: Matthew Skinner <matt@pcmus.com>
* automate the ffmpeg output folder to follow the UID.

Signed-off-by: Matthew Skinner <matt@pcmus.com>
* spotless fixes.

Signed-off-by: Matthew Skinner <matt@pcmus.com>
* Update readme.

Signed-off-by: Matthew Skinner <matt@pcmus.com>
* change to using the userdata folder.

Signed-off-by: Matthew Skinner <matt@pcmus.com>
* change to better field description.

Signed-off-by: Matthew Skinner <matt@pcmus.com>
* Add advanced.

Signed-off-by: Matthew Skinner <matt@pcmus.com>
* Add link to docs.

Signed-off-by: Matthew Skinner <matt@pcmus.com>
* improve readme.

Signed-off-by: Matthew Skinner <matt@pcmus.com>
* improve example path in readme.

Signed-off-by: Matthew Skinner <matt@pcmus.com>
* Update bundles/org.openhab.binding.ipcamera/README.md

Cut and paste bandit strikes again. thanks.

Signed-off-by: Matthew Skinner <matt@pcmus.com>
Co-authored-by: Fabian Wolter <github@fabian-wolter.de>
* Change to using ipcamera as folder loc.

Signed-off-by: Matthew Skinner <matt@pcmus.com>
Co-authored-by: Fabian Wolter <github@fabian-wolter.de>