On Open: Hide Branta Window

[keith-gardner]

Branta is meant to run in the background.

Currently, the Branta UI opens when I turn on my Mac.

This Issue is to make it so when you login to Windows/Linux/Mac, Branta is running but no UI window shows up by default.

Clicking the "Branta" Icon in the menu or dock should still open the UI.

[kylemccullen]

This is working on correctly Windows. Linux/Mac have a separate startup process