Tray design

[gaktive]

We're seeing issues and pull requests come in for expanding the functionality of our tray, with new menu options to manage various options such as:

• Proxy selection (which may need labels): Tray option to toggle proxy connection configured in the preference #5256
• Restart: Add Restart Tray Button and Command #5337

We also have some semantics around Preferences vs. Settings here: #3840

We need to consider a design that keeps the tray menu simple so that new users aren't overwhelmed with a whole list of options, so as we see contributions come in, we need a way to organize where we would group options along with prioritizing what are the most important features to make available.