Initial task parameters are being included in task log of info

With the release of taskwarrior 3.3, we got back the task log feature, **awesome**, thanks for that! However, I noticed that the log now includes the initial values of task parameters. This is different from how it was previously (which in of itself doesn't have to be a bad thing) and I think it also doesn't really make sense: after all the point of the log is to show _changes_. One can easily infer the initial values by inspecting the changes and comparing them to the current value. Moreover, this log can take up a lot of screen estate if you have large amount of UDAs (which is usually the case for tasks imported via `bugwarrior`).

Hence, would it be possible to go back to showing _only changes to the task in the task info log_? Is there a technical reason for this new behavior? I know that taskwarrior moved to sqlite in the 3.x version, so perhaps that has something to do with this new behavior.

If it is technically feasible, I could also have a go at implementing this "fix" myself if @djmitche is stretched for time. I haven't had a look at the new `task info` implementation, but I am somewhat familiar with the previous version of the code-base.