fixes#13160
- remove unused types
- use System.Numerics when possible
- move own created types from OpenTK namespace to CoreGraphics
- create missing types in CoreGraphics namespace
Co-authored-by: Rolf Bjarne Kvinge <rolf@xamarin.com>
We've modified our NUnitLite to special-case the native types, so that they
can easily be compared with the standard types, but that doesn't work anymore
when switching to the official NUnit[Lite], so change all asserts to
explicitly convert whenever needed.
Stephane Delcroix
Rolf Bjarne Kvinge
Timothy Risi