enhancement: implement special tags (me, op, mod)

[AkesiSeli]

Technical details

This PR contains several changes for user tag management, namely:

•  move the entry point for user tags from profile to settings
• allow to create colorless tags (and fix bug with "cancel" in color dialog)
• display colorless tag indicatorss with border
• create special tag categories: "me", "op" and "mod"
• handle new user tag categories in UI
• color username for "me" and "op" tags if there is a custom color selected
• include special tags in the tag list without the possibility to rename/delete them or open the user list

Additional notes

This is an iteration over #196, #197 and #201.

[codecov]

Codecov Report

Attention: Patch coverage is 85.52632% with 11 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...ccoonforlemmy/core/persistence/data/UserTagType.kt	65.00%	3 Missing and 4 partials ⚠️
...ast/eattrash/raccoonforlemmy/main/MainViewModel.kt	0.00%	2 Missing ⚠️
...persistence/repository/DefaultUserTagRepository.kt	85.71%	0 Missing and 1 partial ⚠️
...istence/usecase/DefaultCreateSpecialTagsUseCase.kt	97.56%	0 Missing and 1 partial ⚠️

Flag	Coverage Δ
unittests	57.55% <85.52%> (+0.39%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...emmy/core/notifications/NotificationCenterEvent.kt	4.34% <ø> (+0.03%)	⬆️
...coonforlemmy/core/persistence/data/UserTagModel.kt	100.00% <100.00%> (ø)
...y/core/persistence/repository/UserTagRepository.kt	0.00% <ø> (ø)
...mmy/domain/identity/usecase/DefaultLoginUseCase.kt	73.33% <100.00%> (+0.73%)	⬆️
...my/domain/lemmy/repository/DefaultUserTagHelper.kt	90.47% <100.00%> (+0.47%)	⬆️
...forlemmy/feature/profile/main/ProfileMainScreen.kt	0.00% <ø> (ø)
...orlemmy/feature/profile/menu/ProfileMenuContent.kt	0.00% <ø> (ø)
...persistence/repository/DefaultUserTagRepository.kt	87.67% <85.71%> (+1.30%)	⬆️
...istence/usecase/DefaultCreateSpecialTagsUseCase.kt	97.56% <97.56%> (ø)
...ast/eattrash/raccoonforlemmy/main/MainViewModel.kt	0.00% <0.00%> (ø)
... and 1 more