obslog: add initial support for showing note in obslog This add a very basic and initial support for showing the note stored in the obsmarker in obslog to test the upcoming changes which adds support. The UI is not finalised and will be improved in the patches after support is added and we have tests with the current output.

test-drop.t
test-inhibit.t
test-simple4server.t
tests/test-simple4server-bundle2.t