feat(milestone): milestone tables, views, forms and one selection model

milestone view printed the list row, and milestone list hid the due date
and progress. milestone list now shows ID TITLE [STATE] DUE PROGRESS, open
milestones first and by due date; milestone view shows the state, due
date, progress, description and the milestone's web page (also --web).

Every milestone command addresses milestones by title or ID. Mutations
report ✓ lines: milestone create also prints the new milestone's URL and
takes the title as an argument; close and reopen skip milestones already
in that state; delete names the milestone in its confirmation; milestone
issue add and remove report one line such as "✓ Added #1, #2 to
milestone "v1.0" in alice/x". milestone issue list uses the issue table.
milestone edit without flags on a terminal opens the milestone form with
the current values, and every milestone command completes milestone
titles and has help text with examples.

Signed-off-by: bircni <bircni@icloud.com>

internal/app/human_output_test.go

@@ -173,7 +173,8 @@ func TestMultiItemHumanOutputPagesOnce(t *testing.T) {
 		want string
 	}{
 		{[]string{"branch", "list"}, "Showing 2 of 2 branches in alice/project\n\nNAME            COMMIT  PROTECTED  UPDATED  MESSAGE\nmain (default)  abc\ndev             def\n"},
-		{[]string{"milestone", "issue", "list", "3"}, "1  Issue 1    closed  issue\n2  Issue 2    closed  issue\n"},
+		{[]string{"milestone", "issue", "list", "3"}, "Showing 2 of 2 open issues and pull requests in milestone \"v1\" of alice/project\n\n" +
+			"ID  TITLE    LABELS  KIND   AUTHOR  UPDATED\n#1  Issue 1          issue\n#2  Issue 2          issue\n"},
 		{[]string{"issue", "comment", "list", "5"}, "#1  alice\n  one\n\n#2  bob\n  two\n"},
 	} {
 		t.Run(tc.args[0]+" "+tc.args[1], func(t *testing.T) {