Fixes, more options

Update 2023.03.24:

- fixed many issues in solitaire variants. Now the list of solitaires shows in white those which should definitely work (just recently re-tested) and in gray those that may still have issues. Will fix more in a later update
- for all solitaires with names in white, there are now proper rules available ("?" button), In EN and in RU
- can select card backs
- foundations, tableaus and other spots now have different placeholders, you can select their style in gfx options
- gfx options for board layout, card animations on/off (off is better if you aim at time-related achievements), animation speed
- audio options moans on/off, better sfx for card moves
- card movement should now be smoother
- better hints (some useless hints won't be shown), hints now highlight involved cards and locations
- other minor fixes