check_app_version library

1. check_app_version package
2. documentation
3. check_app_version.dart

check_app_version package

1. Libraries
2. check_app_version
3. components/accessory_check_update
4. components/components
5. components/dialogs/app_version_custom_dialog
6. components/dialogs/app_version_dialog
7. components/dialogs/app_version_overlay_dialog
8. models/json_file
9. utils/utils