Require an exact match to the tag when releasing

Change-Id: Id4860109d680f50a94581fb407a8b9320cc68668
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@digia.com>
Use a regular function pointer for visiting

No need for a PMF.

Change-Id: I926b51be3e1a1a1ac4fb7dafc670b48a76fe88d2
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@digia.com>
Print a sorted list of Qt versions

Right now, we're getting a directory order, which is arbitrary.

Change-Id: Ia40c62ba9704fcc22504b1282f430e1fb18255d9
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@digia.com>