Have date of commit in template.

[The-Ludwig]

Problem Description

Currently, there is no way of printing the date of a version in the template.
Making creatordate available would be useful.

Proposed Solution

My fork fixed this by adding creatordate to the version-tuple and adding a filter to the templating engine, which allows formatting that date.
If wanted, I am happy to merge my fork after writing down documentation for the new features.