Central logging facility

[rfc2119]

Currently, there's a status bar onto which manual messages are written. Ideally, each service would have its own logger pouring into a central location (e.g the status bar)

https://github.com/rfc2119/aws-tui/blob/589c186deb0dbb0b0f512b7103b57db424a43d5d/model/ec2.go#L17-L23