Consider options for mobile support

[Nebula-Developer]

We will either be using Maui or Xamarin.
Xamarin appears to be more stable, although its support is ending in May. Both platforms have official support for SkiaSharp.

[Nebula-Developer]

I will be most likely going for Maui, although other graphical libraries like SDL could potentially work. The native abilities of Maui seem like they could prove useful.

Additionally, I will be migrating the SDL platform along with any 'extra' platforms to a separate project, under a separate nuget package.

[Nebula-Developer]

Consider:

• https://www.nuget.org/packages/Silk.NET.Windowing.Sdl.iOS/
• https://github.com/dotnet/Silk.NET/blob/aa4c2b3ab36e8ce9380fea95f1f54126f6c5b89d/src/Lab/Experiments/TriangleNET6/

[Nebula-Developer]

We have to also consider multi-finger input, which would probably consist of some changes to the InputContext (convert MousePosition to an array, eg. MousePositions, with MousePosition pointing towards MousePositions[0])