* move user tags from profile menu to settings
* make it possible to create colorless tags
and solve the bug with "Cancel" on the color picker dialog
* display colorless tags with outline
* introduce UserTagType and remove useless data class
* migrate DB schema and update repository
* add use case to create special tags
* call use case when needed
* update l10n
* add extension to populate special tags
* update UI components
* update screens where tags are displayed
* set custom username color for me and op cases
* filter out special tags from user detail selection
* update tag management screen
- prevent special tag deletion
- prevent special tag renaming
- show special tags first in list
- preserve tag type upon editing
- show border around colorless tags
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