List of UI Improvements

[x] There should be feedback about what's missing when uploading an app. At the very least all required fields need to have a * to indicate that they are required.
[x] The version field should not be pre-populated unless it is actually taken from the package.json file
[x] InstallAppFromBytes modal should not be closable on side-click otherwise all the bytes need to get refetched.
[x] Toast message after successful application install "[app name] installed successfully."
[x] Description, subtitle etc. is not shown, they should be shown, and should be able to be edited
[x] It would be nice to have some UI (maybe a dialog) to offer to update the UI for all instances of the same app at once instead of having to update it separately for each instance.
[x] Creating a publisher seems confusing to me at the moment because there is not explanation whatsoever what's happening and why that's necessary
[x] Update application install details (input fields)
[x] change app icon to not transparent one

holochain / launcher