Inform non-connected users of active serves

[boatbomber]

Resolves #586.

Oftentimes users forget to connect to their served project, and waste time "debugging" when really their changes just aren't synced. This PR adds a periodic check for served projects when you're not already connected, and will notify you (and output a Log.warn) if there's a serve that you're not connected to.
Notification GUIs now have action buttons on them, smoothing out the process of responding to their contents.

Pressing "Connect" will connect to the served project. Pressing "Ignore" will add that project name to an ephemeral ignore list so it will stop notifying you about that particular served project for the remainder of this Studio session, resetting the ignore list next time you open Studio.

Of course, you can disable all of this with a setting.

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To Do:

• Redesign notification UI to allow for buttons
• Add actions to notifications
• Add function to find served project
• Periodically search for served project while not connected
• Add setting to disable periodic scans
• Break the scan loop on App unmount