Nextbox-ui-plugin

* Bugfix for the config sanitizer.

* Code cleanup.
* Minor bugfixes and visual enhancements in topoSphere.js.
* Add plugin-specific filters support for Saved Filters.

* Handle cables with incomplete terminations properly. Fixes https://github.com/iDebugAll/nextbox-ui-plugin/issues/154.
* Use node IDs derived from device IDs.
* Update topoSphere to handle some edge bundling edge cases.

Implementing new modal windows for the nodes and edges available on right mouse button click.