wrapWine application versioning & desktop entry icons

Hello! I successfully package [EstlCAM](https://estlcam.de) using your `wrapWine` module but I have some suggestions/questions: 1. Since the script isn't version-aware it's not able to implement updates later on (e.g. by re-running the `firstrunScript` or a custom `upgradeScript` 2. How can I access an icon inside the wineprefix after the firstrunscript has ran? The idea is to create a desktop entry with the icon taken from inside the installation folder Thank you!