Improve "records" window

[fheroes2bugs]

Preliminary checks

• I've checked that there aren't other open issues on the same topic.

Describe the problem requiring a solution

AI is getting stronger with every patch, so the same records in new version will be harder.
I played a lot of M maps so my XL maps records are gone forever and I can not compete myself in these maps...

Describe the possible solution

I suggest to add some features to records windows:

1. Button to clear records
2. Make every record to be saved forever, so 2 buttons with up and down arrows.
3. Chosen difficulty. I can watch the size of the map, the difficulcty of the map, but chosen difficulty is gone forever, that is sad.

PS I understand, that this window needs to be redrawn, it is not easy. So perhaps some designer will pick this issue in a year or two...

Additional info

No response

[ihhub]

I am moving this issue into the discussion section as the proposed ideas will not work for all versions of the game (languages) and it requires more than adding stuff into the existing window.