zxtune-android: Android TV more compatible request

[hao1973]

This seems like a weird request but I want it to be more compatible with Android TV. Here are 3 things that I want you to implement (maybe it is a little difficult to implement):

1. Fix not in "landscape" mode. (This problem has been persisting since version r5040)
2. Fallback to legacy file chooser if SAF is unavailable since Android TV doesn't have SAF for some reason
3. Make it so arrow keys (and other keys that cycle such as Tab, PageUp, PageDown, etc.) cycle through menus and such (and make it supports multi-selection too)
   I know that the program is already compatible with Android TV but it would be great if you make it more compatible with Android TV.