On game analysis DB search: search both players, scroll games section, adjust pieces background

[Gennaro Tedesco]

Describe the feature

When performing specific database search by position (see screenshot below) only one player's search field is provided to narrow down the search

Would it be possible to extend the search to both players, given a certain position? For players with thousands of games in the database only specifying one does not narrow down the search enough to browse the games in the corresponding section. This brings me to the other point of the games database in the game analysis section not allowing for scrolling (see screenshot)

most of the times many more games exist, they do not however show up because the table only limits to N results (may be similar to #243).

Last but not the least, when setting up positions manually for database search the black pieces shade back into the background - not sure if this is specific to my computer colour settings (I tried to change them but the issue persists): perhaps one could add a gray background so that both white and black pieces display sharply enough?

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As always, this software is terrific, thank you for the latest release, it's awesome!