Tauri 2.0, WiP until Tauri-2.0 is released

[hrzlgnm]

Closes #18
Closes #195

Todos

• Update the workflows based on tauri-action to most recent documentation of tauri-action
• Updater plugin Migrate to updater plugin #195 and front-end Add frontend code for updater, to allow for checking for updates #210
• Redo the src-tauri/src/main.rs to src-tauri/src/lib,rs split, as the sources diverged
• Add is_android command in back-end -> provide via context, hide About if android is true in front-end
• Address Layout issues due to wider input field on android