Porting Android/MD3 motion library

[MovGP0]

• This PR contains code ported from the AndroidX (Kotlin) code for animations in MaterialDesign3.
• Further details can be found in the Motion.md file.

[MovGP0]

ℹ️ Ammended the following:

• NuGet definition for *.csproj
  • Note that we might not want to publish this library as a dedicated NuGet, but package it together with the MaterialDesignThemes package.
• Moved some classes to match the file name with the class name.
• Added the ArcSpline class that I missed

[MovGP0]

Sidenote: I also made a dedicated library for handling different spline types. I use it at work for robotics.

Might come in handy for animating motion or color transitions.
https://github.com/MovGP0/Splines

[MovGP0]

ℹ️ The following changes have been ammended:

• enforced warnings as errors
• fixed warnings