UI: More advanced customization for what happens when Ryujinx loses focus

src/Ryujinx/AppHost.cs

src/Ryujinx/Assets/locales.json

src/Ryujinx/Common/ThemeManager.cs

src/Ryujinx/RyujinxApp.axaml.cs

src/Ryujinx/UI/ViewModels/AboutWindowViewModel.cs

src/Ryujinx/UI/ViewModels/SettingsViewModel.cs

src/Ryujinx/UI/Views/Settings/SettingsUIView.axaml

src/Ryujinx/UI/Windows/MainWindow.axaml.cs

...yujinx/Utilities/Configuration/ConfigurationFileFormat.cs

...x/Utilities/Configuration/ConfigurationState.Migration.cs

...ujinx/Utilities/Configuration/ConfigurationState.Model.cs

src/Ryujinx/Utilities/Configuration/ConfigurationState.cs

src/Ryujinx/Utilities/Configuration/UI/FocusLostType.cs