Differenciate icons between Android and iOS

[simo498]

All of the icons in the project are from the material library; android specific icons shouldn't be in the iOS version, which should iOS icons (from the Cupertino lib) to make them more uniform with the OS

1. We can make custom icons to use in both Android and iOS, but this is out of scope for now, since we're using default icons (maybe in the future something more personal could be introduced by the UI team)

2. Use icons from both the material and cupertino library, in particular:

   • Icons available either in the cupertino and in the material library can be used as they are
   • Icons which are not available in Cupertino (there are way less icons inside CupertinoIcons than Icons will be used interchangable (another solution could be to use the outlined version on iOS without the filling color, to make it more "iOSish")

I'll wait for an input from the UI/UX team, in that case i can take the issue and implement it