Windows, macOS & Linux Support

[mantreshkhurana]

Add support for Windows, macOS & Linux, since OpenStore API has access to open store in these platforms we just need to commect windows, macos & linux APIs in flutter plugin.

Implement store_version_checker in a better way where it must be replaced by something which supports all platforms.

[mantreshkhurana]

I will add two functionalities in desktop apps to update themselves.

1. From store.
2. From a json file using url.

• To update from store it will be as simple as update available on App Store and Play Store, if app version on device is lower than app version on Mac App Store/Flatpak/Windows Store.
• A user will provide a json file with a custom format which will have the version keyword for the app and download url as well,

e.g.

app_path = "https://storage.example.com/downloads/app/app.exe"
json_url = "https://storage.example.com/downloads/app/app.json"

You won't have to write like this though, I will add this to the old checkAppUpdate function itself. I will make it simpler than ever so you can manage all OS apps from one simple function.

[mantreshkhurana]

This is the first schema we will use for UI on all desktop platforms, after completing plugin classes we will shift to native looking UI/UX for each platform, we will also allow developers to use custom dialogs like we do for Android & iOS right now.