Backup shortcuts (#144)

* Add initial option to back up shortcuts

* Show list of backups

* Reload backups on change

* Restore backups

* Improve UX of backup ui

* Reorganize ui

* Update version in cargo.toml

* Update flatpak description

* Update cargo-lock.json

src/ui/mod.rs

@@ -1,10 +1,12 @@
 mod defines;
+mod ui_backup;
 mod ui_image_download;
 mod ui_import_games;
 mod ui_settings;
 mod uiapp;
 
 pub use defines::*;
+pub use ui_backup::*;
 pub use ui_image_download::*;
 pub use ui_import_games::*;
 pub use ui_settings::*;