Add a reload option to the menu so config file changes can be easily loaded

I often make changes to pg_hba.conf or make changes to the logging config, so it would be great if I could just signal a reload from the task bar menu rather than having to start and stop the app.

Apologies that the branch has some cruft (b6528c2 and 79b0383) as I had make those changes to make the project build locally.