* UI: Fix empty homebrew icon
We currently don't check the icon size when we read it from the homebrew data. That could cause issues at UI side since the buffer isn't null but empty. Extra check have been added UI side too.
(I cleaned up some files during my research too)
Fixes#5188
* Remove additional check
* Remove unused using
* Changed LastPlayed field from string to nullable DateTime
Added ApplicationData.LastPlayedString property
Added NullableDateTimeConverter for the DateTime->string conversion in Avalonia
* Added migration from string-based last_played to DateTime-based last_played_utc
* Updated comment style
* Added MarkupExtension to NullableDateTimeConverter and changed its usage
Cleaned up leftover usings
* Missed one comment
* Ava UI: Expose games build ID for cheat management
* Fix bad merge
* Change integrity check level to error on invalid
* Add support for GDK
* Remove whitespace
* Add BID identifier
* PR Comments fix
* Restore title id in cheats GTK window
* use halign center instead of margin_left
* Merge
* fix after merge
* PR comments fix - design AVA
* PR fix - Move GetApplicationBuildId to ApplicationData class
* PR comment fix - Add empty line before method
* Align with PR #4755
* PR comments fix
* Change BuildId label to support translation
* Comments fix
* Remove unused BuildIdLabel property
