Add tray icon status for active commands/backstage

Currently the SC tray icon has no colored glyph to indicate when SC is connected but inactive, a red glyph when it is disconnected/offline, and a green glyph when an interactive session is active. It would be nice if a glyph were added to indicate when a command or backstage session were active (I think orange would be ideal). 

Reasoning: This would be nice for our clients with slower connections to be able to see that we're actively working on their computers "behind the scenes" so they don't turn it off on us.