Aitchessbee

Settings: improved visibility of text and buttons

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**What's this PR do?** Improves text and button visibility in settings page as reported in #1357 **Screenshots?** Old:  New:  **You have tested this PR on:** - [ ]...

Left sidebar: Added ordering feature for server tabs

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**What's this PR do?** fixes #548 Ordering feature for server tabs using drag and drop Libraries added - SortableJS, @types/sortablejs **You have tested this PR on:** - [ ] Windows...

Tray: unread messages icon fix for linux

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Fixes #1364 **You have tested this PR on:** - [ ] Windows - [x] Linux/Ubuntu - [ ] macOS