* Feature/pair categories re (#1)
Implemented pair categories:
- Paired users can now get tags
- Tags get rendered into the main UI as groups
- Tags are persistently stored on the local configuration
* Added multi-server capabilities and cleaned up code
- Tags and available tags are stored per API url
- Added a few tooltips
* Renamed both dictionary to reflect the fact that they are per-server dictionaries
* Swapped icons and no longer renders groups that are empty after filter
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