refactor(windows): simplify position and duration processing

[Gustl22]

Description

Continue #1548

Checklist

• The title of my PR starts with a Conventional Commit prefix (fix:, feat:, docs:, chore: etc).
• I have read the Contributor Guide and followed the process outlined for submitting PRs.
• I have updated/added tests for ALL new/updated/fixed functionality.
• I have updated/added relevant documentation and added dartdoc comments with ///, where necessary.
• I have updated/added relevant examples in example.

Breaking Change

• Yes, this is a breaking change.
• No, this is not a breaking change.

Related Issues

Closes #1547

[Gustl22]

@SNNafi I pushed my changes here. Can you test, if that still fixes your issue? Thank you for your previous work :)

[spydon]

Lgtm! Is it handled as double seconds for the other platforms as well already?

[Gustl22]

@spydon the media player for windows provides the time in double seconds, so I didn't see a point to convert it to Hns (hundred nanoseconds) first, as it also takes 64bit space and is not more accurate. And then convert from Hns to ms...
But in the end our interface takes milliseconds only, as integer.
So it doesn't make a difference in precision. And my test confirms that, even without the changes, the precision is already on 1ms on windows.

So for the other platforms it is not relevant if handled in double or int, as it has to be delivered as integer ms in the end.

[SNNafi]

@Gustl22, Sorry for the late reply. Working fine.